Compilare: user.cpp: In function ‘void Add(unsigned int)’: user.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (it->first==nr) ^ user.cpp: In function ‘void Substract(unsigned int)’: user.cpp:56:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (it->first==nr) ^ user.cpp: In function ‘unsigned int Check(unsigned int)’: user.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (it->first==nr) ^ user.cpp: In function ‘unsigned int citeste()’: user.cpp:27:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, VAL, stdin), poz=0; ^ user.cpp:32:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, VAL, stdin), poz=0; ^ user.cpp: In function ‘unsigned int Check(unsigned int)’: user.cpp:70:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:74:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.in", "r", stdin); ^ user.cpp:75:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv5.out", "w", stdout); ^