Compilare: main.cpp: In function 'int compEdge(const std::pair<int, int>&, const std::pair<int, int>&)': main.cpp:21:48: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return i.first<j.first || i.first==j.first && i.second<j.second; ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<M.size();i++){ ~^~~~~~~~~ main.cpp:64:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++){ ~^~~~~~~~~~~~