Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:66:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int &p = ptr[nod]; p < G[nod].size(); p++){ | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:109:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for(i = 0; i < e2.size(); i++){ | ~~^~~~~~~~~~~