Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:41:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < E[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:139:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < E[i].size(); j++) { ^