Compilare: user.cpp: In function ‘void gigi2()’: user.cpp:121:12: warning: unused variable ‘timp’ [-Wunused-variable] double timp = -pq2.top().second; ^~~~ user.cpp: In function ‘int main()’: user.cpp:136:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cameras.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:14:38: 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, 4096, fin); ^