Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:12:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<w[x].size(); i++) ^ user.cpp: In function ‘void DFS1(int)’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<print.size();i++) ^