Compilare: main.cpp: In function 'bool exista(int, int)': main.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int j=0;j<G[i].size();j++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int i=0;i<G[x.i].size();i++){ | ~^~~~~~~~~~~~~~