Compilare: user.cpp: In function ‘int bfs(int)’: user.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[nod].size();i++) { ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:37:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for (i=1;i<=n;i++) ^~~ user.cpp:39:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ bfs(r); ^~~