Eroare de compilare: user.cpp: In function ‘bool cmp(const char*, const char*)’: user.cpp:13: error: ‘strcmp’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:22: error: ‘strlen’ was not declared in this scope user.cpp:28: error: ‘strlen’ was not declared in this scope user.cpp:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result