Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:19:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int i=0;i<adj[nod].size();i++) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'bool rec(int)': main.cpp:48:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i=0;i<v[nod].sons.size();i++) | ~^~~~~~~~~~~~~~~~~~~