Compilare: user.cpp: In function ‘int main()’: user.cpp:66:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!viz[i] && minime > possibleDays[i].sz()){ ^ user.cpp:77:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<possibleDays[posRed].sz();i++){ ^ user.cpp:87:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<possibleDays[posRed].sz();i++){ ^ user.cpp:31:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("input.in","r",stdin); ^ user.cpp:84:18: warning: array subscript is below array bounds [-Warray-bounds] ans[currDayAns] = posRed; ^