Compilare: main.cpp: In function 'void remake(std::vector<std::pair<int, int> >&, std::vector<std::pair<int, int> >&, int, int, int, int)': main.cpp:8:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp: In function 'int verif(int, std::vector<std::pair<int, int> >&, int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.in","r",stdin); ^ main.cpp:46:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.in","w",stdout); ^ main.cpp:73:12: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<l; ^