Compilare: user.cpp: In function ‘void dijkstra(int, int*)’: user.cpp:32:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adj[v].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:100:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < a[j].size(); ++k) ^