Compilare: user.cpp: In function ‘int Can(int, int, std::vector<std::pair<int, int> >)’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < P.size(); ++ i) ^ user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < P.size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:70:24: warning: ‘Ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%i\n", Ans); ^