Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<V[v].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:92:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<D.size(); j++) ^ user.cpp:113:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<R[i].size(); j++) ^ user.cpp:117:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<R[i].size(); j++) ^