Compilare: main.cpp: In function 'void DFS(int)': main.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<edge[node].size(); i++){ ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:18: warning: unused variable 'j' [-Wunused-variable] int V, Q, i, j, src, dest, root; ^ main.cpp:119:50: warning: 'ans2' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << max << ' ' << ans1 << ' ' << ans2 << '\n'; ^~~~ main.cpp:119:35: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << max << ' ' << ans1 << ' ' << ans2 << '\n'; ^~~ main.cpp:45:15: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] DFS (root); ^