Compilare: user.cpp: In function ‘int main()’: user.cpp:28:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ord.size();i++) ^ user.cpp:29:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<ord.size();j++) ^ user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=j+1;k<ord.size();k++){ ^ user.cpp: In function ‘void DFS(int)’: user.cpp:54:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[p].size();i++){ ^