Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:43:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<GP[x0].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A.size();++i) ^ user.cpp:84:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<A.size();++j) ^