Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:24:20: 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:56:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<L[nod].size(); i++){ ~^~~~~~~~~~~~~~