Compilare: user.cpp: In function ‘int main()’: user.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp:32:9: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for ( i=2; i<=n; i++) ^~~ user.cpp:34:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ cout<<"\n"; ^~~~