Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:23: error: ‘struct std::pair<int, int>’ has no member named ‘push_back’ user.cpp:42: error: ‘struct std::pair<int, int>’ has no member named ‘begin’ user.cpp:42: error: ‘struct std::pair<int, int>’ has no member named ‘end’ user.cpp:14: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result