Compilare: main.cpp: In function 'int main()': main.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(j=0; j<G[i].size(); j++){ | ~^~~~~~~~~~~~ main.cpp:25:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(k=0; k<G[a].size(); k++){ | ~^~~~~~~~~~~~ main.cpp:38:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(i=0; i<G[x].size(); i++){ | ~^~~~~~~~~~~~