Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for ( int i = 0; i < G[u].size(); ++i ) { | ~~^~~~~~~~~~~~~ main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for ( int i = 0; i < G[u].size(); ++i ) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:17: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] 50 | int mn = 1e9, pos; | ^~~