Compilare: main.cpp: In function 'int main()': main.cpp:45:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i =0 ; i < sol.size() ; ++ i ) ~~^~~~~~~~~~~~ main.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i =0 ; i < sol.size() ; ++ i ) ~~^~~~~~~~~~~~ main.cpp:24:13: warning: unused variable 'j' [-Wunused-variable] lll i , j ; ^ main.cpp:26:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("minmax.in", "r", stdin); ^ main.cpp:27:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("minmax.out", "w", stdout); ^