Compilare: user.cpp: In function ‘bool comp(std::pair<int, int>, std::pair<int, int>)’: user.cpp:18:51: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return A.second > B.second || A.second==B.second && A.first<B.first; ^ user.cpp: In function ‘void BFS(int)’: user.cpp:54:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vect.size(); i++) ^