Compilare: main.cpp: In function 'int get_area(std::vector<std::pair<int, int> >&)': main.cpp:65:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pos_p < positive.size() and positive[pos_p].first <= i){ ~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:69:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(pos_n < negative.size() and negative[pos_n].first <= i){ ~~~~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void setIO(std::__cxx11::string, bool, bool)': main.cpp:7:51: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(input) freopen(inputname.c_str(), "r", stdin); ^ main.cpp:8:54: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(output) freopen(outputname.c_str(), "w", stdout); ^