Compilare: user.cpp: In function ‘int DFS(int, int, int)’: user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<V[x].size(); i++) ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<V[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<V[1].size(); i++) ^