Compilare: main.cpp: In function 'void dfs(int)': main.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 1; i <= n; i++) ^~~ main.cpp:68:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' out <<'\n'; ^~~