Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<ls[x].size();i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (i=1;i<=n;i++) ^~~ main.cpp:29:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout<<s; ^~~~