Dec 18 2023

C++ quiz by PVS-Studio and Sergei Kushnirenko

Dec 18 2023

Questions: 18

Time: 20 min

The PVS-Studio team created a new C++ quiz! But this time we collabed with Sergei Kushnirenko: the questions for this quiz are errors he described in his articles. Try to spot an error in C++ code and test your language knowledge! But we must warn you: the errors are not so easy to find.
There are 18 code fragments. Each of these fragments contains an error. You need to find this error and select a correct answer in the quiz. Ready to test your skills?
By the way, at the end of the quiz, you'll find a link to an article with a detailed analysis of the correct answers:)

{"uid": "kushnirenko_quiz", "time": {"ru": "20 \u043c\u0438\u043d", "en": "20 min", "fr": "20 min"}, "image": {"ru": "https://files.pvs-studio.com/media/quest/kushnirenko-zaglavka-ru_thm__-x-.png", "fr": "https://files.pvs-studio.com/media/quest/kushnirenko-zaglavka_thm__-x-.png", "en": "https://files.pvs-studio.com/media/quest/kushnirenko-zaglavka_thm__-x-.png"}, "text": {"ru": "\u041a\u043e\u043c\u0430\u043d\u0434\u0430 PVS-Studio \u0432\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0435\u0440\u0433\u0435\u0435\u043c \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0430 \u043a\u0432\u0438\u0437 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043e\u0448\u0438\u0431\u043e\u043a, \u043e\u043f\u0438\u0441\u0430\u043d\u043d\u044b\u0445 \u0432 \u0435\u0433\u043e \u0441\u0442\u0430\u0442\u044c\u044f\u0445. \u041f\u043e\u043f\u0440\u043e\u0431\u0443\u0439\u0442\u0435 \u043d\u0430\u0439\u0442\u0438 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 C++ \u043a\u043e\u0434\u0435 \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0441\u0432\u043e\u044e \u0432\u043d\u0438\u043c\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0438 \u0437\u043d\u0430\u043d\u0438\u0435 \u044f\u0437\u044b\u043a\u0430. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0430\u0435\u043c: \u043e\u0448\u0438\u0431\u043a\u0438 \u043d\u0435 \u0442\u0430\u043a\u0438\u0435 \u0443\u0436 \u0438 \u043f\u0440\u043e\u0441\u0442\u044b\u0435!\r\n\u0412 \u044d\u0442\u043e\u043c \u043a\u0432\u0438\u0437\u0435 \u0432\u044b \u043d\u0430\u0439\u0434\u0435\u0442\u0435 18 \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u043e\u0432 \u043a\u043e\u0434\u0430. \u0412 \u043a\u0430\u0436\u0434\u043e\u043c \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0435 \u0441\u043f\u0440\u044f\u0442\u0430\u043b\u0430\u0441\u044c \u043e\u0448\u0438\u0431\u043a\u0430. \u041a\u0430\u043a\u0430\u044f \u2014 \u0440\u0435\u0448\u0430\u0442\u044c \u0432\u0430\u043c, \u043c\u044b \u043b\u0438\u0448\u044c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043c \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u044b \u043e\u0442\u0432\u0435\u0442\u0430. \u0413\u043e\u0442\u043e\u0432\u044b \u0438\u0441\u043f\u044b\u0442\u0430\u0442\u044c \u0441\u0432\u043e\u0438 \u0441\u0438\u043b\u044b?\r\n\u0410 \u043f\u043e\u0447\u0435\u043c\u0443 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u043c \u043e\u043a\u0430\u0437\u0430\u043b\u0441\u044f \u0442\u043e\u0442 \u0438\u043b\u0438 \u0438\u043d\u043e\u0439 \u043e\u0442\u0432\u0435\u0442, \u0432\u044b \u0441\u043c\u043e\u0436\u0435\u0442\u0435 \u0443\u0437\u043d\u0430\u0442\u044c \u0432 \u043a\u043e\u043d\u0446\u0435 \u043a\u0432\u0438\u0437\u0430 :)", "en": "The PVS-Studio team created a new C++ quiz! But this time we collabed with Sergei Kushnirenko: the questions for this quiz are errors he described in his articles. Try to spot an error in C++ code and test your language knowledge! But we must warn you: the errors are not so easy to find.\r\nThere are 18 code fragments. Each of these fragments contains an error. You need to find this error and select a correct answer in the quiz. Ready to test your skills?\r\nBy the way, at the end of the quiz, you'll find a link to an article with a detailed analysis of the correct answers:)", "fr": "The PVS-Studio team created a new C++ quiz! But this time we collabed with Sergei Kushnirenko: the questions for this quiz are errors he described in his articles. Try to spot an error in C++ code and test your language knowledge! But we must warn you: the errors are not so easy to find.\r\nThere are 18 code fragments. Each of these fragments contains an error. You need to find this error and select a correct answer in the quiz. Ready to test your skills?\r\nBy the way, at the end of the quiz, you'll find a link to an article with a detailed analysis of the correct answers:)"}, "title": {"ru": "\u0421++ \u043a\u0432\u0438\u0437 \u043e\u0442 PVS-Studio \u0438 \u0421\u0435\u0440\u0433\u0435\u044f \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e", "en": "C++ quiz by PVS-Studio and Sergei Kushnirenko", "fr": "C++ quiz by PVS-Studio and Sergei Kushnirenko"}, "questions": [{"description": {"ru": "<pre>void UObject::setDeltaPitch(const UMatrix &gizmo) {   ....   if (_fpzero(amount, eps))     return   rotateAccum.setAnglesXYZ(axis);   .... }\n</pre> ", "en": "<pre>void UObject::setDeltaPitch(const UMatrix &gizmo) {   ....   if (_fpzero(amount, eps))     return   rotateAccum.setAnglesXYZ(axis);\n  .... }\n</pre> ", "fr": "<pre>void UObject::setDeltaPitch(const UMatrix &gizmo) {   ....   if (_fpzero(amount, eps))     return   rotateAccum.setAnglesXYZ(axis);\n  .... }\n</pre> "}, "answers": [{"text": {"ru": "\u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u0437\u0434\u0435\u0441\u044c \u0432\u0441\u0451 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e. \u042d\u0442\u043e \u043f\u0440\u0438\u043c\u0435\u0440 \u0434\u043b\u044f \u0440\u0430\u0437\u043c\u0438\u043d\u043a\u0438.", "en": "Actually, everything's correct. This is just a warm-up example.", "fr": "Actually, everything's correct. This is just a warm-up example."}, "value": 0}, {"text": {"ru": "\u0423 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 _fpzero \u043c\u0435\u0441\u0442\u0430\u043c\u0438 \u043f\u0435\u0440\u0435\u043f\u0443\u0442\u0430\u043d\u044b \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u044b.", "en": "The actual arguments are mixed up in the _fpzero function.", "fr": "The actual arguments are mixed up in the _fpzero function."}, "value": 0}, {"text": {"ru": "\u041a\u043b\u0430\u0441\u0441 UMatrix \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u0435\u0442 \u0442\u0438\u043f\u0430\u043c\u0438 float, \u0438\u0437-\u0437\u0430 \u0447\u0435\u0433\u043e \u043d\u0435 \u0445\u0432\u0430\u0442\u0430\u0435\u0442 \u0442\u043e\u0447\u043d\u043e\u0441\u0442\u0438. \u0421\u043b\u0435\u0434\u043e\u0432\u0430\u043b\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c UMatrixD, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u0443\u044e \u043d\u0430 \u0442\u0438\u043f\u0430\u0445 double.", "en": "The UMatrix class uses the float types, accuracy suffers as the result. Developers should have used UMatrixD based on the double types.", "fr": "The UMatrix class uses the float types, accuracy suffers as the result. Developers should have used UMatrixD based on the double types."}, "value": 0}, {"text": {"ru": "\u041e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 \u043d\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u043b\u043e\u0433\u0438\u043a\u0435 \u0435\u0433\u043e \u0440\u0430\u0431\u043e\u0442\u044b.", "en": "The code design doesn't match the logic of its operation.", "fr": "The code design doesn't match the logic of its operation."}, "value": 1}], "image": {"ru": "https://files.pvs-studio.com/media/quest/1-ru_SI0MrMh_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/1-en_59Cr6Z7_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/1-en_59Cr6Z7_thm__218x-.png"}}, {"description": {"ru": "<pre>void UContentPackage::createPackage(dsaFile *m, const void *v, int size) {   unsigned char secretDsaKey[3096], L;   const unsigned char *p = v;   int i, j, t;   ....   UContent::generateDsaKey(secretDsaKey, sizeof(salt));   ....   // there was some code to encrypt and sign the file   ....   memset (secretDsaKey, 0, sizeof(secretDsaKey)); }\n</pre> ", "en": "<pre>void UContentPackage::createPackage(dsaFile *m, const void *v, int size) {   unsigned char secretDsaKey[3096], L;   const unsigned char *p = v;   int i, j, t;   ....   UContent::generateDsaKey(secretDsaKey, sizeof(salt));   ....   // there was some code to encrypt and sign the file   ....   memset (secretDsaKey, 0, sizeof(secretDsaKey)); }\n</pre> ", "fr": "<pre>void UContentPackage::createPackage(dsaFile *m, const void *v, int size) {   unsigned char secretDsaKey[3096], L;   const unsigned char *p = v;   int i, j, t;   ....   UContent::generateDsaKey(secretDsaKey, sizeof(salt));   ....   // there was some code to encrypt and sign the file   ....   memset (secretDsaKey, 0, sizeof(secretDsaKey)); }\n</pre> "}, "answers": [{"text": {"ru": "\u0424\u0443\u043d\u043a\u0446\u0438\u044f memset \u043d\u0435\u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0430\u044f. \u0412\u044b\u0448\u0435 \u0441\u043e\u0437\u043d\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u0432\u043d\u0435\u0441\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u0441\u0432\u043e\u0434\u044f\u0449\u0430\u044f\u0441\u044f \u043a \u043f\u0435\u0440\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memset.", "en": "The memset function is fake. The above is an intentional vulnerability that overrides the memset function.", "fr": "The memset function is fake. The above is an intentional vulnerability that overrides the memset function."}, "value": 0}, {"text": {"ru": "\u041a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0443\u0434\u0430\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memset, \u0442\u0430\u043a \u043a\u0430\u043a \u0441 \u0435\u0433\u043e \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u043e\u043d\u0430 \u043d\u0435 \u043d\u0443\u0436\u043d\u0430.", "en": "The compiler removes the call to memset because it thinks it's not needed here.", "fr": "The compiler removes the call to memset because it thinks it's not needed here."}, "value": 1}, {"text": {"ru": "\u041a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0443\u0434\u0430\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memset \u0438\u0437-\u0437\u0430 \u0440\u0435\u0434\u043a\u043e\u0433\u043e \u0431\u0430\u0433\u0430. \u0411\u0430\u0433 \u0431\u044b\u043b \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0430, \u043d\u043e \u0438\u043c\u0435\u043d\u043d\u043e \u043a\u043e\u0433\u0434\u0430 \u0431\u0430\u0433 \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b\u0441\u044f, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0430\u0441\u044c \u0442\u0430 \u0441\u0430\u043c\u0430\u044f \u043d\u0435\u0443\u0434\u0430\u0447\u043d\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f.", "en": "The compiler removes the call to memset due to a rare bug. The next compiler release fixed it. However, the broken version was used when the bug was discovered.", "fr": "The compiler removes the call to memset due to a rare bug. The next compiler release fixed it. However, the broken version was used when the bug was discovered."}, "value": 0}, {"text": {"ru": "\u041e\u0448\u0438\u0431\u043a\u0430 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 generateDsaKey. \u041e\u043d\u0430 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0431\u0443\u0444\u0435\u0440, \u0438 \u0447\u0430\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0432\u043e\u043e\u0431\u0449\u0435 \u043d\u0435 \u043f\u043e\u0439\u043c\u0438 \u0433\u0434\u0435.", "en": "An error is in the generateDsaKey function. It overflows the buffer, and some data gets lost somewhere.", "fr": "An error is in the generateDsaKey function. It overflows the buffer, and some data gets lost somewhere."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/10-ru_mcafTfn_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/10-en_GdqEVbX_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/10-en_GdqEVbX_thm__218x-.png"}}, {"description": {"ru": "<pre>struct X {   int a : 2   int b : 2 } x; Thread 1: void foo() { x.a = 1 } Thread 2: void boo() { x.b = 1 }\n</pre> \n\n", "en": "<pre>struct X {   int a : 2   int b : 2 } x; Thread 1: void foo() { x.a = 1 } Thread 2: void boo() { x.b = 1 }\n</pre> \n\n", "fr": "<pre>struct X {   int a : 2   int b : 2 } x; Thread 1: void foo() { x.a = 1 } Thread 2: void boo() { x.b = 1 }\n</pre> \n\n"}, "answers": [{"text": {"ru": "\u0417\u0430\u043f\u0438\u0441\u0438 \u0432 \u043f\u043e\u043b\u044f a \u0438 b \u043d\u0435 \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u0430\u0442\u043e\u043c\u0430\u0440\u043d\u044b\u043c\u0438. \u041e\u043d\u0438 \u043c\u043e\u0433\u0443\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c\u0441\u044f \u0447\u0430\u0441\u0442\u0438\u0447\u043d\u043e \u0438 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u043c\u0438.", "en": "The entries in the a and b fields are non-atomic. They can be partially executed, and other operations can interrupt them.", "fr": "The entries in the a and b fields are non-atomic. They can be partially executed, and other operations can interrupt them."}, "value": 1}, {"text": {"ru": "\u0418\u0437-\u0437\u0430 \u0431\u0430\u0433\u0430 \u0432 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0435 \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0441\u044f \u0440\u0430\u0437\u043c\u0435\u0440 \u043f\u0435\u0440\u0432\u043e\u0433\u043e \u043f\u043e\u043b\u044f. \u042d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u043b\u043e \u043a \u0442\u043e\u043c\u0443, \u0447\u0442\u043e \u043f\u0440\u0438 \u0437\u0430\u043f\u0438\u0441\u0438 \u0432 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e a \u0442\u0430\u043a\u0436\u0435 \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u043b\u0430\u0441\u044c \u0438 b.", "en": "The size of the first field was ignored due to a bug in the compiler. So, if a was written to a variable, b would also be overwritten.", "fr": "The size of the first field was ignored due to a bug in the compiler. So, if a was written to a variable, b would also be overwritten."}, "value": 0}, {"text": {"ru": "\u0417\u0430\u0431\u044b\u043b\u0438, \u0447\u0442\u043e \u043e\u0434\u0438\u043d \u0431\u0438\u0442 \u0442\u0440\u0430\u0442\u0438\u0442\u0441\u044f \u043f\u043e\u0434 \u0437\u043d\u0430\u043a, \u0438\u0437-\u0437\u0430 \u0447\u0435\u0433\u043e \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0434\u0432\u0443\u0445\u0431\u0438\u0442\u043e\u0432\u044b\u0445 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u043e\u043a\u0430\u0437\u0430\u043b\u0441\u044f \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u0435\u043d: [-2..1]. \u041d\u0443\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0434\u0435\u043b\u0430\u0442\u044c \u043f\u043e\u043b\u044f \u0438\u0437 3 \u0431\u0438\u0442.", "en": "The developers forgot that a character takes one bit, making the value range of two-bit variables insufficient: [-2..1]. They needed to make three-bit fields.", "fr": "The developers forgot that a character takes one bit, making the value range of two-bit variables insufficient: [-2..1]. They needed to make three-bit fields."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/9-ru_mf04U5l_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/9-en_yj8gUGU_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/9-en_yj8gUGU_thm__218x-.png"}}, {"description": {"ru": "<pre>const size_t maxThreads = 10; void fill_texture_mt(int thread_id, std::mutex *pm) {   std::lock_guard<std::mutex> lk(*pm);   // Access data protected by the lock. } void prepare_texture() {   std::thread threads[maxThreads];   std::mutex m;   for (size_t i = 0; i < maxThreads; ++i) {     threads[i] = std::thread(fill_texture_mt, i, &m);   } }\n</pre> \n \n \n \n", "en": "<pre>const size_t maxThreads = 10;\nvoid fill_texture_mt(int thread_id, std::mutex *pm) {\n  std::lock_guard<std::mutex> lk(*pm);\n  // Access data protected by the lock.\n}\nvoid prepare_texture() {\n  std::thread threads[maxThreads];\n  std::mutex m;\n  for (size_t i = 0; i < maxThreads; ++i) {\n    threads[i] = std::thread(fill_texture_mt, i, &m);\n  }\n}\n</pre> \n \n \n \n", "fr": "<pre>const size_t maxThreads = 10;\nvoid fill_texture_mt(int thread_id, std::mutex *pm) {\n  std::lock_guard<std::mutex> lk(*pm);\n  // Access data protected by the lock.\n}\nvoid prepare_texture() {\n  std::thread threads[maxThreads];\n  std::mutex m;\n  for (size_t i = 0; i < maxThreads; ++i) {\n    threads[i] = std::thread(fill_texture_mt, i, &m);\n  }\n}\n</pre> \n \n \n \n"}, "answers": [{"text": {"ru": "\u0412\u044b\u0431\u0440\u0430\u043d \u043d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0439 \u043a\u043b\u0430\u0441\u0441 \u0434\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a.", "en": "The wrong default class was selected for implementing locks.", "fr": "The wrong default class was selected for implementing locks."}, "value": 0}, {"text": {"ru": "\u041e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e\u0442\u043e\u043a\u043e\u0432. \u0418\u0437-\u0437\u0430 \u044d\u0442\u043e\u0433\u043e \u043c\u044c\u044e\u0442\u0435\u043a\u0441 \u0443\u0434\u0430\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0440\u0430\u0437\u0443 \u043f\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 prepare_texture, \u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0438 \u043f\u043e\u0442\u043e\u043a\u043e\u0432 \u043d\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442.", "en": "There is no waiting for threads to be completed. Therefore, the mutex is removed once the prepare_texture function finishes, and no thread locking occurs.", "fr": "There is no waiting for threads to be completed. Therefore, the mutex is removed once the prepare_texture function finishes, and no thread locking occurs."}, "value": 1}, {"text": {"ru": "\u0412 \u043f\u0440\u0438\u0432\u0435\u0434\u0451\u043d\u043d\u043e\u043c \u043a\u043e\u0434\u0435 \u0432\u0441\u0451 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e. \u0414\u0440\u0443\u0433\u043e\u0435 \u0434\u0435\u043b\u043e, \u0447\u0442\u043e \u044d\u0442\u043e \u043d\u0435\u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u0440\u0430\u0441\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0438\u0432\u0430\u043d\u0438\u044f. \u041d\u043e \u044d\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u0430\u044f \u0442\u0435\u043c\u0430.", "en": "The above code is correct. However, this type of parallelization is inefficient, but that's a different story.", "fr": "The above code is correct. However, this type of parallelization is inefficient, but that's a different story."}, "value": 0}, {"text": {"ru": "\u041f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f m \u0434\u043e\u043b\u0436\u043d\u0430 \u0431\u044b\u0442\u044c \u043e\u0431\u044a\u044f\u0432\u043b\u0435\u043d\u0430 \u0441\u043e \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u043c volatile.", "en": "We need to declare the m variable with the volatile specifier.", "fr": "We need to declare the m variable with the volatile specifier."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/9-ru_rgI6o2m_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/9-en_YqG8jfa_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/9-en_YqG8jfa_thm__218x-.png"}}, {"description": {"ru": "<pre>int var_add(int first, int second, ...) {   int r = first + second;   va_list va;   va_start(va, second);   while (int v = va_arg(va, int)) {     r += v;   }   va_end(va);   return r; }\n</pre> ", "en": "<pre>int var_add(int first, int second, ...) {   int r = first + second;   va_list va;   va_start(va, second);   while (int v = va_arg(va, int)) {     r += v;   }   va_end(va);   return r; }\n</pre> ", "fr": "<pre>int var_add(int first, int second, ...) {   int r = first + second;   va_list va;   va_start(va, second);   while (int v = va_arg(va, int)) {     r += v;   }   va_end(va);   return r; }\n</pre> "}, "answers": [{"text": {"ru": "\u041e\u0431\u044a\u044f\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 va \u0434\u043e\u043b\u0436\u043d\u043e \u0431\u044b\u0442\u044c \u0432 \u0441\u0430\u043c\u043e\u043c \u043d\u0430\u0447\u0430\u043b\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043e \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 r.", "en": "The declaration of the va variable should come right at the beginning of the function, before the r variable.", "fr": "The declaration of the va variable should come right at the beginning of the function, before the r variable."}, "value": 0}, {"text": {"ru": "\u041f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u043c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c 0. \u0418\u043d\u0430\u0447\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u0435\u0442 \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435.", "en": "The last function parameter should be 0. Otherwise, undefined behavior occurs.", "fr": "The last function parameter should be 0. Otherwise, undefined behavior occurs."}, "value": 0}, {"text": {"ru": "\u041f\u0435\u0440\u0435\u0434\u0430\u0447\u0430 \u043b\u044e\u0431\u043e\u0433\u043e \u0442\u0438\u043f\u0430 \u043a\u0440\u043e\u043c\u0435 int \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044e.", "en": "Passing any type other than int results in undefined behavior.", "fr": "Passing any type other than int results in undefined behavior."}, "value": 0}, {"text": {"ru": "\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u0432\u0435\u0440\u043d\u044b 2 \u0438 3.", "en": "Options 2 and 3 are both correct.", "fr": "Options 2 and 3 are both correct."}, "value": 1}, {"text": {"ru": "\u041f\u0440\u0438\u0432\u0435\u0434\u0451\u043d\u043d\u044b\u0439 \u043a\u043e\u0434 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0435\u043d. \u041e\u0448\u0438\u0431\u043a\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0432\u0435\u0434\u0451\u043d\u043d\u043e\u0439 \u0438\u0437\u0432\u043d\u0435 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0438\u0437-\u0437\u0430 \u0438\u0433\u0440 \u0441 \u043c\u0430\u043a\u0440\u043e\u0441\u0430\u043c\u0438).", "en": "The code fragment is correct. An error is external (for example, if somebody has tampered with macros).", "fr": "The code fragment is correct. An error is external (for example, if somebody has tampered with macros)."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/7-ru_WxVv5p1_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/7-en_Q4MnWj4_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/7-en_Q4MnWj4_thm__218x-.png"}}, {"description": {"ru": "<pre>static std::mutex m; static int shared_resource = 0; void increment_by_42() {   std::unique_lock<std::mutex>(m);   shared_resource += 42; }\n</pre> \n", "en": "<pre>static std::mutex m; static int shared_resource = 0; void increment_by_42() {   std::unique_lock<std::mutex>(m);   shared_resource += 42; }\n</pre> \n", "fr": "<pre>static std::mutex m; static int shared_resource = 0; void increment_by_42() {   std::unique_lock<std::mutex>(m);   shared_resource += 42; }\n</pre> \n"}, "answers": [{"text": {"ru": "\u041d\u0435\u0441\u043c\u043e\u0442\u0440\u044f \u043d\u0430 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0443, \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e shared_resource \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043e\u0431\u044a\u044f\u0432\u0438\u0442\u044c \u043a\u0430\u043a volatile.", "en": "Despite the locking, developers need to declare the shared_resource variable as volatile.", "fr": "Despite the locking, developers need to declare the shared_resource variable as volatile."}, "value": 0}, {"text": {"ru": "\u041f\u0435\u0440\u0435\u0434 \u043d\u0430\u043c\u0438 \u0441\u043e\u0437\u0434\u0430\u0451\u0442\u0441\u044f \u0438 \u0442\u0443\u0442 \u0436\u0435 \u0443\u043d\u0438\u0447\u0442\u043e\u0436\u0430\u0435\u0442\u0441\u044f \u0430\u043d\u043e\u043d\u0438\u043c\u043d\u044b\u0439 \u043e\u0431\u044a\u0435\u043a\u0442. \u041f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u043e\u043d \u0442\u0443\u0442 \u0436\u0435 \u0443\u043d\u0438\u0447\u0442\u043e\u0436\u0430\u0435\u0442\u0441\u044f, \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430 \u043d\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442.", "en": "An anonymous object is created and destroyed right away. No locking occurs because it's immediately destroyed.", "fr": "An anonymous object is created and destroyed right away. No locking occurs because it's immediately destroyed."}, "value": 0}, {"text": {"ru": "\u0417\u0434\u0435\u0441\u044c \u0441\u043e\u0437\u0434\u0430\u0451\u0442\u0441\u044f \u043d\u043e\u0432\u0430\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0441 \u0438\u043c\u0435\u043d\u0435\u043c m, \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0421\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043c\u044c\u044e\u0442\u0435\u043a\u0441 \u0437\u0430\u0445\u0432\u0430\u0447\u0435\u043d \u043d\u0435 \u0431\u0443\u0434\u0435\u0442.", "en": "A new variable named m is created here, it's initialized by default. So, the mutex isn't captured.", "fr": "A new variable named m is created here, it's initialized by default. So, the mutex isn't captured."}, "value": 1}], "image": {"ru": "https://files.pvs-studio.com/media/quest/6-ru_EYEf15h_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/6-en_3n846So_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/6-en_3n846So_thm__218x-.png"}}, {"description": {"ru": "<pre>struct AreaCrc32 {   unsigned char buffType = 0;   int crc = 0; }; AreaCrc32 s1 {}; AreaCrc32 s2 {}; void similarArea(const AreaCrc32 &s1, const AreaCrc32 &s2) {   if (!std::memcmp(&s1, &s2, sizeof(AreaCrc32))) {     // ....   } }\n</pre> \n\n", "en": "<pre>struct AreaCrc32 {   unsigned char buffType = 0;   int crc = 0; }; AreaCrc32 s1 {}; AreaCrc32 s2 {}; void similarArea(const AreaCrc32 &s1, const AreaCrc32 &s2) {   if (!std::memcmp(&s1, &s2, sizeof(AreaCrc32))) {     // ....   } }\n</pre> \n\n", "fr": "<pre>struct AreaCrc32 {   unsigned char buffType = 0;   int crc = 0; }; AreaCrc32 s1 {}; AreaCrc32 s2 {}; void similarArea(const AreaCrc32 &s1, const AreaCrc32 &s2) {   if (!std::memcmp(&s1, &s2, sizeof(AreaCrc32))) {     // ....   } }\n</pre> \n\n"}, "answers": [{"text": {"ru": "\u0412\u0441\u0451 \u043f\u0440\u043e\u0441\u0442\u043e. \u041e\u043f\u0435\u0447\u0430\u0442\u043a\u0430. \u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u043e\u0442\u0440\u0438\u0446\u0430\u043d\u0438\u044f (!) \u043b\u0438\u0448\u043d\u0438\u0439.", "en": "The answer is simple: it's a typo. The negation operator (!) is redundant.", "fr": "The answer is simple: it's a typo. The negation operator (!) is redundant."}, "value": 0}, {"text": {"ru": "\u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u0432\u044b\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u043d\u0438\u0435\u043c \u043f\u043e\u043b\u0435\u0439 \u0432 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435.", "en": "The issue relates to the field alignment in the structure.", "fr": "The issue relates to the field alignment in the structure."}, "value": 1}, {"text": {"ru": "\u0412\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442\u0441\u044f \u0440\u0430\u0437\u043c\u0435\u0440 \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f \u0432\u043c\u0435\u0441\u0442\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b.", "en": "The pointer size is calculated instead of the structure size.", "fr": "The pointer size is calculated instead of the structure size."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/5-ru_VA5tjhv_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/5-en_qZygAsE_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/5-en_qZygAsE_thm__218x-.png"}}, {"description": {"ru": "<pre>struct S { S(const S *) noexcept; /* ... */ }; class T {   int n;   S *s1; public:   T(const T &rhs) : n(rhs.n),                     s1(rhs.s1 ? new S(rhs.s1) : nullptr) {}   ~T() { delete s1; }   // ...   T& operator=(const T &rhs) {     n = rhs.n;     delete s1;     s1 = new S(rhs.s1);     return *this;   } };\n</pre> \n \n \n \n", "en": "<pre>struct S { S(const S *) noexcept; /* ... */ }; class T {   int n;   S *s1; public:   T(const T &rhs) : n(rhs.n),                     s1(rhs.s1 ? new S(rhs.s1) : nullptr) {}   ~T() { delete s1; }   // ...   T& operator=(const T &rhs) {     n = rhs.n;     delete s1;     s1 = new S(rhs.s1);     return *this;   } };\n</pre> \n \n \n \n", "fr": "<pre>struct S { S(const S *) noexcept; /* ... */ }; class T {   int n;   S *s1; public:   T(const T &rhs) : n(rhs.n),                     s1(rhs.s1 ? new S(rhs.s1) : nullptr) {}   ~T() { delete s1; }   // ...   T& operator=(const T &rhs) {     n = rhs.n;     delete s1;     s1 = new S(rhs.s1);     return *this;   } };\n</pre> \n \n \n \n"}, "answers": [{"text": {"ru": "\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0435\u0435 \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c return rhs;", "en": "Writing return rhs would be more correct.", "fr": "Writing return rhs would be more correct."}, "value": 0}, {"text": {"ru": "\u0412 operator = \u043d\u0435\u0442 \u0437\u0430\u0449\u0438\u0442\u044b, \u0447\u0442\u043e \u043e\u0431\u044a\u0435\u043a\u0442 \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0441\u0430\u043c \u0441\u0435\u0431\u0435.", "en": "There is no protection against assigning the object to itself in operator =.", "fr": "There is no protection against assigning the object to itself in operator =."}, "value": 0}, {"text": {"ru": "\u0412 operator = \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043e\u0431\u043d\u0443\u043b\u0438\u0442\u044c \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c s1 \u043f\u043e\u0441\u043b\u0435 delete s1;. \u0418\u043d\u0430\u0447\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0434\u0432\u043e\u0439\u043d\u043e\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043f\u0430\u043c\u044f\u0442\u0438.", "en": "You need to zeroize the s1 pointer after delete s1; in operator =. Otherwise, the double free may occur.", "fr": "You need to zeroize the s1 pointer after delete s1; in operator =. Otherwise, the double free may occur."}, "value": 0}, {"text": {"ru": "\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e 2 \u0438 3.", "en": "Options 2 and 3 are both correct.", "fr": "Options 2 and 3 are both correct."}, "value": 1}, {"text": {"ru": "\u0415\u0441\u043b\u0438 \u044d\u0442\u043e 64-\u0431\u0438\u0442\u043d\u043e\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435, \u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b, \u043f\u043e\u043c\u0435\u043d\u044f\u0432 \u043c\u0435\u0441\u0442\u0430\u043c\u0438 \u043f\u043e\u043b\u044f n \u0438 s1. \u0420\u0430\u0437\u043c\u0435\u0440 \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u0441\u044f \u0441 16 \u0434\u043e 12 \u0431\u0430\u0439\u0442.", "en": "If it's a 64-bit application, you can lower the size of the structure by swapping the n and s1 fields. The size will decrease from 16 bytes to 12 bytes.", "fr": "If it's a 64-bit application, you can lower the size of the structure by swapping the n and s1 fields. The size will decrease from 16 bytes to 12 bytes."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/5-ru_HDnuCNi_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/5-en_cvRGnUF_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/5-en_cvRGnUF_thm__218x-.png"}}, {"description": {"ru": "<pre>// header a.h constexpr inline const char* super_secret(void) {   constexpr const char *STRING = \"string\";   return STRING; } // somewhere in a.dll if (super_secret() == saved_string_ptr) // somewhere in b.dll if (super_secret() != saved_string_ptr)\n</pre> \n\n", "en": "<pre>// header a.h constexpr inline const char* super_secret(void) {   constexpr const char *STRING = \"string\";   return STRING; } // somewhere in a.dll if (super_secret() == saved_string_ptr) // somewhere in b.dll if (super_secret() != saved_string_ptr)\n</pre> \n\n", "fr": "<pre>// header a.h constexpr inline const char* super_secret(void) {   constexpr const char *STRING = \"string\";   return STRING; } // somewhere in a.dll if (super_secret() == saved_string_ptr) // somewhere in b.dll if (super_secret() != saved_string_ptr)\n</pre> \n\n"}, "answers": [{"text": {"ru": "\u0420\u0430\u0437 \u044d\u0442\u043e \u0432 h-\u0444\u0430\u0439\u043b\u0435, \u0442\u043e \u0436\u0434\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c, \u0435\u0441\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u044d\u0442\u0443 \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 DLL. \u0412 \u043a\u0430\u0436\u0434\u043e\u0439 \u0431\u0443\u0434\u0435\u0442 \u0441\u0432\u043e\u0439 \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440 \u0441\u0442\u0440\u043e\u043a\u0438.", "en": "It's in the h-file, so using this function in different DLLs can be problematic. Each DLL has its own string instance.", "fr": "It's in the h-file, so using this function in different DLLs can be problematic. Each DLL has its own string instance."}, "value": 1}, {"text": {"ru": "\u0424\u0443\u043d\u043a\u0446\u0438\u044f \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c \u043d\u0430 \u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u0441\u0442\u0440\u043e\u0447\u043a\u0443, \u0438 \u0435\u0433\u043e \u043d\u0435\u043b\u044c\u0437\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c. \u0412\u0435\u0440\u043d\u0435\u0435, \u044d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044e.", "en": "The function returns a pointer to a temporary line, and the pointer can't be used. Or rather, the use of it leads to undefined behavior.", "fr": "The function returns a pointer to a temporary line, and the pointer can't be used. Or rather, the use of it leads to undefined behavior."}, "value": 0}, {"text": {"ru": "constexpr \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u0437\u0430\u043c\u0435\u043d\u0438\u0442\u044c \u043d\u0430 static.", "en": "We need to replace constexpr with static.", "fr": "We need to replace constexpr with static."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/4-ru_9YSHhY3_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/4-en_9zaQ594_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/4-en_9zaQ594_thm__218x-.png"}}, {"description": {"ru": "<pre>char destBuffer[16]; void serialize(bool x) {   const char* whichString = x ? \"true\" : \"false\";   const size_t len = strlen(whichString);   memcpy(destBuffer, whichString, len); } int main() {   bool x;   serialize(x);   printf(\"%s\", destBuffer);   return 0; }\n</pre> \n", "en": "<pre>char destBuffer[16]; void serialize(bool x) {   const char* whichString = x ? \"true\" : \"false\";   const size_t len = strlen(whichString);   memcpy(destBuffer, whichString, len); } int main() {   bool x;   serialize(x);   printf(\"%s\", destBuffer);   return 0; }\n</pre> \n", "fr": "<pre>char destBuffer[16]; void serialize(bool x) {   const char* whichString = x ? \"true\" : \"false\";   const size_t len = strlen(whichString);   memcpy(destBuffer, whichString, len); } int main() {   bool x;   serialize(x);   printf(\"%s\", destBuffer);   return 0; }\n</pre> \n"}, "answers": [{"text": {"ru": "\u0422\u0430\u043a \u043a\u0430\u043a \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f x \u043d\u0435 \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0430, \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u043a\u043b\u044e\u0447\u0435\u0439 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u0444\u0430\u0437\u044b \u041b\u0443\u043d\u044b \u0431\u0443\u0434\u0435\u0442 \u043f\u0435\u0447\u0430\u0442\u0430\u0442\u044c \u0442\u043e \"true\", \u0442\u043e \"false\".", "en": "Since the x variable is not initialized, the program outputs \"true\" or \"false\" depending on the optimization keys and moon phase.", "fr": "Since the x variable is not initialized, the program outputs \"true\" or \"false\" depending on the optimization keys and moon phase."}, "value": 0}, {"text": {"ru": "\u0418\u0437-\u0437\u0430 \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043d\u0430\u043f\u0435\u0447\u0430\u0442\u0430\u043d\u043e \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \"true\", \"false\", \u043d\u043e \u0435\u0449\u0451 \u0438 \u043f\u0443\u0441\u0442\u0430\u044f \u0441\u0442\u0440\u043e\u043a\u0430.", "en": "Not only \"true\" or \"false\", but also an empty string can show up due to undefined behavior.", "fr": "Not only \"true\" or \"false\", but also an empty string can show up due to undefined behavior."}, "value": 0}, {"text": {"ru": "\u042d\u0442\u043e\u0442 \u043a\u043e\u0434 \u043d\u0435 \u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f.", "en": "The code doesn't compile.", "fr": "The code doesn't compile."}, "value": 0}, {"text": {"ru": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043d\u0435\u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 x \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044e. \u041a\u0430\u043a \u043e\u043d\u043e \u0441\u0435\u0431\u044f \u043f\u0440\u043e\u044f\u0432\u0438\u0442, \u043e\u0431\u0441\u0443\u0436\u0434\u0430\u0442\u044c \u0441\u043c\u044b\u0441\u043b\u0430 \u043d\u0435\u0442. \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u043c\u043e\u0436\u0435\u0442 \u0443\u043f\u0430\u0441\u0442\u044c, \u0440\u0430\u0441\u043f\u0435\u0447\u0430\u0442\u0430\u0442\u044c \u043c\u0443\u0441\u043e\u0440, \u0447\u0442\u043e \u0443\u0433\u043e\u0434\u043d\u043e.", "en": "Using the uninitialized x variable results in undefined behavior. There's no point in discussing what the outcome can be. The program can crash or display garbage \u2014 anything is possible.", "fr": "Using the uninitialized x variable results in undefined behavior. There's no point in discussing what the outcome can be. The program can crash or display garbage \u2014 anything is possible."}, "value": 1}], "image": {"ru": "https://files.pvs-studio.com/media/quest/3-ru_ix7I1LR_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/3-en_FS6X3v8_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/3-en_FS6X3v8_thm__218x-.png"}}, {"description": {"ru": "<pre>void sayHello() {     std::cout << \"Hello, World!\\n\"; } void sayHello() {     std::cout << \"Goodbye, World!\\n\"; } int main() {     sayHello();     return 0; }\n</pre> ", "en": "<pre>void sayHello() {     std::cout << \"Hello, World!\\n\"; } void sayHello() {     std::cout << \"Goodbye, World!\\n\"; } int main() {     sayHello();     return 0; }\n</pre> ", "fr": "<pre>void sayHello() {     std::cout << \"Hello, World!\\n\"; } void sayHello() {     std::cout << \"Goodbye, World!\\n\"; } int main() {     sayHello();     return 0; }\n</pre> "}, "answers": [{"text": {"ru": "\u041d\u0435 \u043c\u043e\u0440\u043e\u0447\u044c\u0442\u0435 \u043c\u043d\u0435 \u0433\u043e\u043b\u043e\u0432\u0443. \u042d\u0442\u043e\u0442 \u043a\u043e\u0434 \u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f.", "en": "Don't mess with my mind. The code doesn't compile.", "fr": "Don't mess with my mind. The code doesn't compile."}, "value": 0}, {"text": {"ru": "\u0411\u0443\u0434\u0435\u0442 \u043d\u0430\u043f\u0435\u0447\u0430\u0442\u0430\u043d\u043e \"Hello, World!\".", "en": "The program will display \"Hello World\".", "fr": "The program will display \"Hello World\"."}, "value": 0}, {"text": {"ru": "\u0411\u0443\u0434\u0435\u0442 \u043d\u0430\u043f\u0435\u0447\u0430\u0442\u0430\u043d\u043e \"Hello, World!\", \u0430 \u043f\u043e\u0442\u043e\u043c \"Goodbye, World!\". \u0415\u0441\u0442\u044c \u0442\u0430\u043a\u0430\u044f \u043c\u0430\u0433\u0438\u044f.", "en": "The program will display \"Hello World\" first, followed by \"Goodbye, World!\". It's a special kind of magic.", "fr": "The program will display \"Hello World\" first, followed by \"Goodbye, World!\". It's a special kind of magic."}, "value": 0}, {"text": {"ru": "\u0422\u0443\u0442 \u0435\u0441\u0442\u044c \u043e\u0434\u0438\u043d \u043f\u0440\u0438\u043a\u043e\u043b, \u043f\u0440\u043e \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u044f \u0443\u0436\u0435 \u0437\u043d\u0430\u044e. \u0418\u043b\u0438 \u043d\u0435 \u0437\u043d\u0430\u044e, \u043d\u043e \u043f\u0440\u0435\u0434\u0432\u0438\u0436\u0443.", "en": "There is a trick I already know about. Or I don't know it yet but can assume.", "fr": "There is a trick I already know about. Or I don't know it yet but can assume."}, "value": 1}], "image": {"ru": "https://files.pvs-studio.com/media/quest/3-ru_yMHrC9M_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/3-en_NrulFmX_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/3-en_NrulFmX_thm__218x-.png"}}, {"description": {"ru": "<pre>int abs_legs(int my_legs) {   if (my_legs < 0) {     return -my_legs;   } }\n</pre> ", "en": "<pre>int abs_legs(int my_legs) {   if (my_legs < 0) {     return -my_legs;   } }\n</pre> ", "fr": "<pre>int abs_legs(int my_legs) {   if (my_legs < 0) {     return -my_legs;   } }\n</pre> "}, "answers": [{"text": {"ru": "\u0427\u0442\u043e \u0442\u0443\u0442 \u0434\u0443\u043c\u0430\u0442\u044c-\u0442\u043e. \u041e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 return \u0432 \u043a\u043e\u043d\u0446\u0435 \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043d\u0435\u043e\u0442\u0440\u0438\u0446\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0447\u0438\u0441\u0435\u043b. \u042d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044e.", "en": "What's there to think about? At the end of the function, there is no return which would be executed for non-negative numbers. This results in undefined behavior.", "fr": "What's there to think about? At the end of the function, there is no return which would be executed for non-negative numbers. This results in undefined behavior."}, "value": 1}, {"text": {"ru": "\u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u043d\u0438\u043a\u043e\u0439 \u0431\u0435\u0434\u044b \u043d\u0435\u0442, \u0442\u0430\u043a \u043a\u0430\u043a \u0438\u0437-\u0437\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f return \u043a\u043e\u0434 \u043d\u0435 \u0441\u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f.", "en": "Actually, there is nothing wrong at all, as the code will not compile because of the missing return.", "fr": "Actually, there is nothing wrong at all, as the code will not compile because of the missing return."}, "value": 0}, {"text": {"ru": "\u0412\u0441\u0451 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e. \u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 C++20, \u043f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e, \u0435\u0441\u043b\u0438 \u043d\u0435\u0442 \u044f\u0432\u043d\u043e\u0433\u043e return, \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0441 \u043e\u0434\u043d\u0438\u043c \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u044d\u0442\u043e\u0442 \u0441\u0430\u043c\u044b\u0439 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442. \u0422.\u0435. \u043a\u0430\u043a \u0440\u0430\u0437 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u0435\u0440\u043d\u0451\u0442 my_legs. \u041f\u0440\u0438\u043a\u043e\u043b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0440\u0430\u043d\u0435\u0435 \u044d\u0442\u043e\u0442 \u043a\u043e\u0434 \u0431\u044b\u043b \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0435\u043d, \u043d\u043e \u043f\u043e\u0447\u0438\u043d\u0438\u043b\u0441\u044f \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0445\u043e\u0434\u0435 \u043d\u0430 C++20.", "en": "Everything is correct. Since C++20, a function with a single argument is assumed to return that argument unless there is an explicit return. That is, the function will simply return my_legs by default. The funny thing is that the code used to be wrong, but was fixed when the developers switched to C++20.", "fr": "Everything is correct. Since C++20, a function with a single argument is assumed to return that argument unless there is an explicit return. That is, the function will simply return my_legs by default. The funny thing is that the code used to be wrong, but was fixed when the developers switched to C++20."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/2-ru_RKd6QvB_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/2-en_DrokZdP_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/2-en_DrokZdP_thm__218x-.png"}}, {"description": {"ru": "<pre>int get_money(int index, const int *pockets) {   int a = index + pockets[++index];   // ....   return a; }\n</pre> ", "en": "<pre>int get_money(int index, const int *pockets) {   int a = index + pockets[++index];   // ....   return a; }\n</pre> ", "fr": "<pre>int get_money(int index, const int *pockets) {   int a = index + pockets[++index];   // ....   return a; }\n</pre> "}, "answers": [{"text": {"ru": "\u041f\u0435\u0440\u0435\u0434 \u043d\u0430\u043c\u0438 \u043d\u0435\u0443\u0442\u043e\u0447\u043d\u0451\u043d\u043d\u043e\u0435 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435.", "en": "We're looking at unspecified behavior.", "fr": "We're looking at unspecified behavior."}, "value": 0}, {"text": {"ru": "\u041f\u0435\u0440\u0435\u0434 \u043d\u0430\u043c\u0438 \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435.", "en": "It's undefined behavior.", "fr": "It's undefined behavior."}, "value": 1}, {"text": {"ru": "\u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 C++17, \u044d\u0442\u043e\u0442 \u043a\u043e\u0434 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0435\u043d, \u0438 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e, \u0447\u0442\u043e \u043e\u043d \u0432\u044b\u0447\u0438\u0441\u043b\u0438\u0442.", "en": "Since C++17, this code is correct, and we know what it will compute.", "fr": "Since C++17, this code is correct, and we know what it will compute."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/1-ru_t63WXJs_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/1-en--1-_rSnBJxI_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/1-en--1-_rSnBJxI_thm__218x-.png"}}, {"description": {"ru": "<pre>void umcp_read_buffer_from_pipe() {   char bufKernel[12];   char bufMatrix[12];   std::cin.width(12);   std::cin >> bufKernel;   std::cin >> bufMatrix; }\n</pre> ", "en": "<pre>void umcp_read_buffer_from_pipe() {   char bufKernel[12];   char bufMatrix[12];   std::cin.width(12);   std::cin >> bufKernel;   std::cin >> bufMatrix; }\n</pre> ", "fr": "<pre>void umcp_read_buffer_from_pipe() {   char bufKernel[12];   char bufMatrix[12];   std::cin.width(12);   std::cin >> bufKernel;   std::cin >> bufMatrix; }\n</pre> "}, "answers": [{"text": {"ru": "\u041d\u0443\u0436\u0435\u043d \u0435\u0449\u0451 \u043e\u0434\u0438\u043d \u0432\u044b\u0437\u043e\u0432 std::cin.width(12).", "en": "Another call to std::cin.width(12) is needed.", "fr": "Another call to std::cin.width(12) is needed."}, "value": 0}, {"text": {"ru": "\u041a\u043e\u0434 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 C++20.", "en": "The code works correctly starting with C++20.", "fr": "The code works correctly starting with C++20."}, "value": 0}, {"text": {"ru": "\u0412\u0435\u0440\u043d\u044b 1 \u0438 2.", "en": "Options 1 and 2 are both correct.", "fr": "Options 1 and 2 are both correct."}, "value": 1}, {"text": {"ru": "\u042d\u0442\u043e \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u044b\u0439 \u043a\u043e\u0434. \u041f\u0440\u043e\u0441\u0442\u043e \u043f\u0440\u0438\u043c\u0435\u0440 \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u0434\u044b\u0448\u043a\u0438 :)", "en": "The code is correct. It's just an example to take a little breather :)", "fr": "The code is correct. It's just an example to take a little breather :)"}, "value": 0}, {"text": {"ru": "\u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c std::cin.width(12-1); \u0447\u0442\u043e\u0431\u044b \u0443\u0447\u0435\u0441\u0442\u044c \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u043d\u043e\u043b\u044c.", "en": "The correct way would be to write std::cin.width(12-1); to take into account the terminal null.", "fr": "The correct way would be to write std::cin.width(12-1); to take into account the terminal null."}, "value": 0}, {"text": {"ru": "\u042d\u0442\u043e\u0442 \u043a\u043e\u0434, \u043d\u0435\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e \u043e\u0442 \u0432\u0432\u043e\u0434\u0438\u043c\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044e.", "en": "The code results in undefined behavior regardless of the input data.", "fr": "The code results in undefined behavior regardless of the input data."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/7-ru_ib3Jx2u_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/7-en_IWSDC2B_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/7-en_IWSDC2B_thm__218x-.png"}}, {"description": {"ru": "<pre>std::string str_func(); void display_string(const char *); void set_display_options() {   const char *str = str_func().c_str();   display_string(str); }\n</pre> \n", "en": "<pre>std::string str_func(); void display_string(const char *); void set_display_options() {   const char *str = str_func().c_str();   display_string(str); }\n</pre> \n", "fr": "<pre>std::string str_func(); void display_string(const char *); void set_display_options() {   const char *str = str_func().c_str();   display_string(str); }\n</pre> \n"}, "answers": [{"text": {"ru": "\u0412\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0439 \u043e\u0431\u044a\u0435\u043a\u0442 \u0441\u0442\u0440\u043e\u043a\u0438 \u0443\u043d\u0438\u0447\u0442\u043e\u0436\u0430\u0435\u0442\u0441\u044f, \u0438 \u043f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c \u043d\u0430 \u0431\u0443\u0444\u0435\u0440 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043d\u0435\u043b\u044c\u0437\u044f.", "en": "The temporary string object is destroyed, and the pointer to the buffer can no longer be used.", "fr": "The temporary string object is destroyed, and the pointer to the buffer can no longer be used."}, "value": 1}, {"text": {"ru": "\u042d\u0442\u043e\u0442 \u043a\u043e\u0434 \u043d\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u0442\u0441\u044f, \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 C++11.", "en": "This code doesn't compile since C++11.", "fr": "This code doesn't compile since C++11."}, "value": 0}, {"text": {"ru": "\u0415\u0441\u043b\u0438 \u0441\u0442\u0440\u043e\u043a\u0430 \u043f\u0443\u0441\u0442\u0430\u044f, \u0442\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c str \u043e\u043a\u0430\u0436\u0435\u0442\u0441\u044f \u0440\u0430\u0432\u0435\u043d nullptr.", "en": "If the string is empty, the str pointer is nullptr.", "fr": "If the string is empty, the str pointer is nullptr."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/5-ru_ovJ69Lw_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/5-en_hMz3f0F_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/5-en_hMz3f0F_thm__218x-.png"}}, {"description": {"ru": "<pre>void morning(const std::string &owner) {   std::fstream bar(owner);   if (!bar.is_open()) {     // Handle error     return;   }   bar << \"customer\";   std::string str;   bar >> str; }\n</pre> \n\n", "en": "<pre>void morning(const std::string &owner) {   std::fstream bar(owner);   if (!bar.is_open()) {     // Handle error     return;   }   bar << \"customer\";   std::string str;   bar >> str; }\n</pre> \n\n", "fr": "<pre>void morning(const std::string &owner) {   std::fstream bar(owner);   if (!bar.is_open()) {     // Handle error     return;   }   bar << \"customer\";   std::string str;   bar >> str; }\n</pre> \n\n"}, "answers": [{"text": {"ru": "\u0412\u0441\u0451 \u0445\u043e\u0440\u043e\u0448\u043e. \u0417\u0430\u043f\u0438\u0448\u0435\u043c \"customer\" \u0438 \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u0435\u043c \u0442\u043e\u0436\u0435 \u0441\u0430\u043c\u043e\u0435.", "en": "It's fine. Let's write \"customer\" and read the same thing.", "fr": "It's fine. Let's write \"customer\" and read the same thing."}, "value": 0}, {"text": {"ru": "\u041c\u044b \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u0435\u043c \u0438\u0437 \u043f\u043e\u0442\u043e\u043a\u0430 \"\u043f\u0443\u0441\u0442\u043e\u0442\u0443\".", "en": "We'll read the \"void\" from the stream.", "fr": "We'll read the \"void\" from the stream."}, "value": 1}, {"text": {"ru": "\u041d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u0430 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430, \u0447\u0442\u043e \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u043e\u0442\u043a\u0440\u044b\u0442\u044c \u043f\u043e\u0442\u043e\u043a.", "en": "The check whether the stream has been opened is implemented incorrectly.", "fr": "The check whether the stream has been opened is implemented incorrectly."}, "value": 0}, {"text": {"ru": "\u041a\u043e\u0434 \u043e\u043f\u0430\u0441\u0435\u043d, \u0435\u0441\u043b\u0438 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0440\u0435\u0436\u0438\u043c \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 -O2.", "en": "The code is dangerous if you enable the -O2 optimization mode.", "fr": "The code is dangerous if you enable the -O2 optimization mode."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/4-ru_qYf6T3H_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/4-en_v46KKfU_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/4-en_v46KKfU_thm__218x-.png"}}, {"description": {"ru": "<pre>class Bard {   int _beer;   int _meal; public:   Bard(int meal) : _meal(meal), _beer(_meal - 1) {} };\n</pre> \n", "en": "<pre>class Bard {   int _beer;   int _meal; public:   Bard(int meal) : _meal(meal), _beer(_meal - 1) {} };\n</pre> \n", "fr": "<pre>class Bard {   int _beer;   int _meal; public:   Bard(int meal) : _meal(meal), _beer(_meal - 1) {} };\n</pre> \n"}, "answers": [{"text": {"ru": "\u041f\u043e\u043b\u044f \u043a\u043b\u0430\u0441\u0441\u043e\u0432 \u043d\u0435\u043b\u044c\u0437\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u0442\u044c \u0441 \u043f\u043e\u0434\u0447\u0451\u0440\u043a\u0438\u0432\u0430\u043d\u0438\u044f. \u042d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043e\u0436\u0438\u0434\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f\u043c \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432.", "en": "You can't start a class field with an underscore character. This leads to unexpected consequences when using some compilers.", "fr": "You can't start a class field with an underscore character. This leads to unexpected consequences when using some compilers."}, "value": 0}, {"text": {"ru": "\u0414\u043b\u044f \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 _beer \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0435\u0449\u0451 \u043d\u0435\u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f _meal.", "en": "The _meal variable, which is not yet initialized, is used to initialize _beer.", "fr": "The _meal variable, which is not yet initialized, is used to initialize _beer."}, "value": 1}, {"text": {"ru": "\u0412\u0441\u0451 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e.", "en": "Everything is correct.", "fr": "Everything is correct."}, "value": 0}, {"text": {"ru": "\u0412\u0441\u0451 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e, \u043f\u0440\u0438 \u0443\u0441\u043b\u043e\u0432\u0438\u0438, \u0447\u0442\u043e \u043e\u0442 \u044d\u0442\u043e\u0433\u043e \u043a\u043b\u0430\u0441\u0441\u0430 \u043d\u0435\u043b\u044c\u0437\u044f \u043d\u0430\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u044c\u0441\u044f.", "en": "Everything is correct if there can be no inheritance from this class.", "fr": "Everything is correct if there can be no inheritance from this class."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/6-ru_rYhdlv8_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/6-en_gx8KwTm_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/6-en_gx8KwTm_thm__218x-.png"}}, {"description": {"ru": "<pre>std::vector<....> formats; .... for (auto format = begin(formats), __end = end(formats);      format != __end; ++format) {   if (snd::CodecNamesEq(....)) {     format->is_stereo = true;     formats.push_back(stereo_format);   } }</pre> ", "en": "<pre>std::vector<....> formats; .... for (auto format = begin(formats), __end = end(formats);      format != __end; ++format) {   if (snd::CodecNamesEq(....)) {     format->is_stereo = true;     formats.push_back(stereo_format);   } }</pre> ", "fr": "<pre>std::vector<....> formats; .... for (auto format = begin(formats), __end = end(formats);      format != __end; ++format) {   if (snd::CodecNamesEq(....)) {     format->is_stereo = true;     formats.push_back(stereo_format);   } }</pre> "}, "answers": [{"text": {"ru": "\u0418\u043c\u0435\u043d\u0430 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u043d\u0435 \u0434\u043e\u043b\u0436\u043d\u044b \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0442\u044c \u0434\u0432\u0430 \u0438\u0434\u0443\u0449\u0438\u0445 \u043f\u043e\u0434\u0440\u044f\u0434 \u043f\u043e\u0434\u0447\u0451\u0440\u043a\u0438\u0432\u0430\u043d\u0438\u044f.", "en": "Variable names should not contain a double underscore.", "fr": "Variable names should not contain a double underscore."}, "value": 0}, {"text": {"ru": "\u041f\u043e\u0441\u043b\u0435 \u0432\u044b\u0437\u043e\u0432\u0430 push_back \u0438\u0442\u0435\u0440\u0430\u0442\u043e\u0440\u044b \u0441\u0442\u0430\u043d\u0443\u0442 \u043d\u0435\u0432\u0430\u043b\u0438\u0434\u043d\u044b\u043c\u0438.", "en": "After push_back is called, the iterators become invalid.", "fr": "After push_back is called, the iterators become invalid."}, "value": 0}, {"text": {"ru": "\u041d\u0443\u0436\u043d\u043e \u043f\u0438\u0441\u0430\u0442\u044c format++, \u0430 \u043d\u0435 ++format. \u0412 \u0434\u0430\u043d\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u044d\u0442\u043e \u0432\u0430\u0436\u043d\u043e.", "en": "We need to write format++, not ++format. It's important here.", "fr": "We need to write format++, not ++format. It's important here."}, "value": 0}, {"text": {"ru": "\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e 1 \u0438 2.", "en": "Options 1 and 2 are both correct.", "fr": "Options 1 and 2 are both correct."}, "value": 1}, {"text": {"ru": "\u041e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e 1, 2 \u0438 3.", "en": "Options 1, 2, and 3 are correct.", "fr": "Options 1, 2, and 3 are correct."}, "value": 0}], "image": {"ru": "https://files.pvs-studio.com/media/quest/10-ru_vYXuEm4_thm__218x-.png", "fr": "https://files.pvs-studio.com/media/quest/10-en_gU9JNc8_thm__218x-.png", "en": "https://files.pvs-studio.com/media/quest/10-en_gU9JNc8_thm__218x-.png"}}], "results": [{"token": "98f13708210194c475687be6106a3b84", "score": 4, "image": {"ru": "https://files.pvs-studio.com/media/quest/June_mIkOp11_thm__300x-.png", "fr": "https://files.pvs-studio.com/media/quest/June_9DpILrk_thm__300x-.png", "en": "https://files.pvs-studio.com/media/quest/June_9DpILrk_thm__300x-.png"}, "title": {"ru": "\u041d\u043e\u0432\u0438\u0447\u043e\u043a", "en": "Rookie", "fr": "Rookie"}, "description": {"ru": "\u0422\u044b \u0435\u0449\u0435 \u0441\u043e\u0432\u0441\u0435\u043c \u0437\u0435\u043b\u0435\u043d\u044b\u0439 \u0432 \u043f\u043e\u0438\u0441\u043a\u0435 \u043e\u0448\u0438\u0431\u043e\u043a \u0432 \u043a\u043e\u0434\u0435. \u041d\u043e \u043d\u0438\u0447\u0435\u0433\u043e \u0441\u0442\u0440\u0430\u0448\u043d\u043e\u0433\u043e — \u0441\u043a\u043e\u0440\u043e \u0442\u044b \u0441\u0442\u0430\u043d\u0435\u0448\u044c \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u043c \u043f\u0440\u043e\u0444\u0438 \u0432 \u044d\u0442\u043e\u043c \u0434\u0435\u043b\u0435!\r\n\u0410 \u0435\u0441\u043b\u0438 \u0432\u0430\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u0443\u0437\u043d\u0430\u0442\u044c \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0435 \u043e\u0442\u0432\u0435\u0442\u044b, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a \u044d\u0442\u0438 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u043e\u044f\u0432\u0438\u043b\u0438\u0441\u044c \u0438 \u043a\u0430\u043a \u0438\u0445 \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c — \u043c\u044b \u0432\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0435\u0440\u0433\u0435\u0435\u043c \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0438 \u0434\u043b\u044f \u0432\u0430\u0441 \u0441\u0442\u0430\u0442\u044c\u044e-\u0440\u0430\u0437\u0431\u043e\u0440 \u0441 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435\u043c \u043a\u0430\u0436\u0434\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438. \u0417\u0430\u0445\u043e\u0434\u0438\u0442\u0435 \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c!", "en": "You're just starting your bug-hunting career. But that's okay — a little bit of practice and you'll become a pro in no time!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!", "fr": "You're just starting your bug-hunting career. But that's okay — a little bit of practice and you'll become a pro in no time!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!"}}, {"token": "3c59dc048e8850243be8079a5c74d079", "score": 9, "image": {"ru": "https://files.pvs-studio.com/media/quest/res3_pNLea2j_thm__300x-.png", "fr": "https://files.pvs-studio.com/media/quest/res3_YMPvPoa_thm__300x-.png", "en": "https://files.pvs-studio.com/media/quest/res3_YMPvPoa_thm__300x-.png"}, "title": {"ru": "\u041e\u043f\u044b\u0442\u043d\u044b\u0439", "en": "Experienced", "fr": "Experienced"}, "description": {"ru": "\u0412\u0438\u0434\u043d\u043e, \u0447\u0442\u043e \u044d\u0442\u043e \u043d\u0435 \u043f\u0435\u0440\u0432\u0430\u044f \u0442\u0432\u043e\u044f \u043e\u0445\u043e\u0442\u0430 \u0437\u0430 \u0431\u0430\u0433\u0430\u043c\u0438! \u041d\u043e \u043c\u043d\u043e\u0433\u0438\u0435 \u0431\u0430\u0433\u0438 \u0435\u0449\u0435 \u043f\u0440\u044f\u0447\u0443\u0442\u0441\u044f \u0432\u043e \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0430\u0445 \u043a\u043e\u0434\u0430. \u041d\u0435\u043c\u043d\u043e\u0433\u043e \u0441\u043d\u043e\u0440\u043e\u0432\u043a\u0438, \u0438 \u0442\u044b \u0441\u043c\u043e\u0436\u0435\u0448\u044c \u043d\u0430\u0439\u0442\u0438 \u0438\u0445 \u0432\u0441\u0435\u0445!\r\n\u0410 \u0435\u0441\u043b\u0438 \u0432\u0430\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u0443\u0437\u043d\u0430\u0442\u044c \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0435 \u043e\u0442\u0432\u0435\u0442\u044b, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a \u044d\u0442\u0438 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u043e\u044f\u0432\u0438\u043b\u0438\u0441\u044c \u0438 \u043a\u0430\u043a \u0438\u0445 \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c — \u043c\u044b \u0432\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0435\u0440\u0433\u0435\u0435\u043c \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0438 \u0434\u043b\u044f \u0432\u0430\u0441 <a href=\"https://pvs-studio.ru/ru/blog/posts/cpp/1091/\">\u0441\u0442\u0430\u0442\u044c\u044e-\u0440\u0430\u0437\u0431\u043e\u0440</a> \u0441 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435\u043c \u043a\u0430\u0436\u0434\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438. \u0417\u0430\u0445\u043e\u0434\u0438\u0442\u0435 \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c!", "en": "It's clearly not your first bug hunt! But many of them are still hiding in the code. Try again to find them!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!", "fr": "It's clearly not your first bug hunt! But many of them are still hiding in the code. Try again to find them!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!"}}, {"token": "b6d767d2f8ed5d21a44b0e5886680cb9", "score": 14, "image": {"ru": "https://files.pvs-studio.com/media/quest/Pro_EIGxePw_thm__300x-.png", "fr": "https://files.pvs-studio.com/media/quest/Pro_FPa0onc_thm__300x-.png", "en": "https://files.pvs-studio.com/media/quest/Pro_FPa0onc_thm__300x-.png"}, "title": {"ru": "\u042d\u043a\u0441\u043f\u0435\u0440\u0442", "en": "Expert", "fr": "Expert"}, "description": {"ru": "\u041e\u0433\u043e, \u0434\u0430 \u0442\u044b \u043c\u0430\u0441\u0442\u0435\u0440 \u0432 \u043f\u043e\u0438\u0441\u043a\u0430\u0445 \u043e\u0448\u0438\u0431\u043e\u043a! \u041d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0432\u0441\u0435 \u0436\u0435 \u0443\u0441\u043a\u043e\u043b\u044c\u0437\u043d\u0443\u043b\u0438 \u043e\u0442 \u0442\u0432\u043e\u0435\u0433\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044f. \u041f\u043e\u043f\u0440\u043e\u0431\u0443\u0435\u0448\u044c \u043d\u0430\u0439\u0442\u0438 \u0438\u0445 \u0432\u0441\u0435\u0445?\r\n\u0410 \u0435\u0441\u043b\u0438 \u0432\u0430\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u0443\u0437\u043d\u0430\u0442\u044c \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0435 \u043e\u0442\u0432\u0435\u0442\u044b, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a \u044d\u0442\u0438 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u043e\u044f\u0432\u0438\u043b\u0438\u0441\u044c \u0438 \u043a\u0430\u043a \u0438\u0445 \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c — \u043c\u044b \u0432\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0435\u0440\u0433\u0435\u0435\u043c \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0438 \u0434\u043b\u044f \u0432\u0430\u0441 <a href=\"https://pvs-studio.ru/ru/blog/posts/cpp/1091/\">\u0441\u0442\u0430\u0442\u044c\u044e-\u0440\u0430\u0437\u0431\u043e\u0440</a> \u0441 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435\u043c \u043a\u0430\u0436\u0434\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438. \u0417\u0430\u0445\u043e\u0434\u0438\u0442\u0435 \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c!", "en": "Wow, you're a professional bug finder! However, some are still left unnoticed. Will you try again?\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!", "fr": "Wow, you're a professional bug finder! However, some are still left unnoticed. Will you try again?\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!"}}, {"token": "37693cfc748049e45d87b8c7d8b9aacd", "score": 18, "image": {"ru": "https://files.pvs-studio.com/media/quest/res4_UsGZsO0_thm__300x-.png", "fr": "https://files.pvs-studio.com/media/quest/res4_lpBbjgL_thm__300x-.png", "en": "https://files.pvs-studio.com/media/quest/res4_lpBbjgL_thm__300x-.png"}, "title": {"ru": "\u041f\u0440\u043e\u0444\u0438", "en": "Professional", "fr": "Professional"}, "description": {"ru": "\u0411\u0440\u0430\u0432\u043e! \u0422\u044b \u043f\u043e\u043a\u0430\u0437\u0430\u043b \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u0439 \u043a\u043b\u0430\u0441\u0441 \u0432 \u043f\u043e\u0438\u0441\u043a\u0435 \u043e\u0448\u0438\u0431\u043e\u043a. \u041d\u0438 \u043e\u0434\u0438\u043d \u0431\u0430\u0433 \u043d\u0435 \u0441\u043c\u043e\u0436\u0435\u0442 \u0443\u0441\u043a\u043e\u043b\u044c\u0437\u043d\u0443\u0442\u044c \u043e\u0442 \u0442\u0432\u043e\u0435\u0433\u043e \u0437\u043e\u0440\u043a\u043e\u0433\u043e \u0432\u0437\u0433\u043b\u044f\u0434\u0430. \u041f\u043e\u0437\u0434\u0440\u0430\u0432\u043b\u044f\u0435\u043c!\r\n\u0410 \u0435\u0441\u043b\u0438 \u0432\u0430\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u0443\u0437\u043d\u0430\u0442\u044c \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0435 \u043e\u0442\u0432\u0435\u0442\u044b, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043a\u0430\u043a \u044d\u0442\u0438 \u043e\u0448\u0438\u0431\u043a\u0438 \u043f\u043e\u044f\u0432\u0438\u043b\u0438\u0441\u044c \u0438 \u043a\u0430\u043a \u0438\u0445 \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c — \u043c\u044b \u0432\u043c\u0435\u0441\u0442\u0435 \u0441 \u0421\u0435\u0440\u0433\u0435\u0435\u043c \u041a\u0443\u0448\u043d\u0438\u0440\u0435\u043d\u043a\u043e \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u043b\u0438 \u0434\u043b\u044f \u0432\u0430\u0441 <a href=\"https://pvs-studio.ru/ru/blog/posts/cpp/1091/\">\u0441\u0442\u0430\u0442\u044c\u044e-\u0440\u0430\u0437\u0431\u043e\u0440</a> \u0441 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435\u043c \u043a\u0430\u0436\u0434\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438. \u0417\u0430\u0445\u043e\u0434\u0438\u0442\u0435 \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c!", "en": "You showed some fantastic skills! No bug can hide from your watchful eye. Congratulations!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!", "fr": "You showed some fantastic skills! No bug can hide from your watchful eye. Congratulations!\r\nAnd if you want to see all correct answers as well as the history of these errors and how to fix them — read <a href=\"https://pvs-studio.com/en/blog/posts/cpp/1091/\">this article</a>. The PVS-Studio team and Sergei Kushirenko will explain every answer in detail. Welcome!"}}]}

C++ quiz by PVS-Studio and Sergei Kushnirenko

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