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:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size()&&ok;j++) ~^~~~~~~~~ main.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a.size() && ok;j++) ~^~~~~~~~~ main.cpp:57:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ~^~~~~~~~~ main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size();j++) ~^~~~~~~~~ main.cpp:75:18: 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:76:18: 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"; ~^~~~~~~~~