Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:24:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int i = 0; i<G[nod].size()-1; i++) { | ~^~~~~~~~~~~~~~~~ main.cpp:25:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int j = i+1; j<G[nod].size(); j++) { | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:28: warning: 'nod' may be used uninitialized [-Wmaybe-uninitialized] 74 | pre[j] = nod; | ~~~~~~~^~~~~ main.cpp:58:17: note: 'nod' was declared here 58 | int nod; | ^~~