Compilare: main.cpp: In function 'void DFS(int)': main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a.size() && ok;j++) ~^~~~~~~~~ main.cpp:49:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) cout<<"["<<a[i].x<<","<<a[i].y<<"] "; ~^~~~~~~~~ main.cpp:51:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size();j++) cout<<"["<<b[j].x<<","<<b[j].y<<"] "; ~^~~~~~~~~ main.cpp:52:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size();j++) ~^~~~~~~~~ main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) cout<<v[i][j]<<" "; ~^~~~~~~~~~~~ main.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) fout<<a[i].x<<" "<<a[i].y<<" 1\n"; ~^~~~~~~~~ main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b.size();i++) fout<<b[i].x<<" "<<b[i].y<<" 2\n"; ~^~~~~~~~~