Compilare: main.cpp: In function 'bool bfs()': main.cpp:61:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for (int i=0; i<adj[u].size(); i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'bool dfs(int)': main.cpp:84:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for (int i=0; i<adj[u].size(); i++) { | ~^~~~~~~~~~~~~~