http://poj.org/problem?id=1751 //* @author: 82638882@163.com import java.io.*; public class Main { public static void main(String[] args) throws NumberFormatException, IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); String[] ss; int b=Integer.parseInt(in.readLine()); int[] ax=new int[b]; int[] ay=new int[b]; int[][] p=new int[b][b]; for(int i=0;i< b;i++) { ss=in.readLine().split(" "); ax[i]=Integer.parseInt(ss[0]); ay[i]=Integer.parseInt(ss[1]); } for(int i=0;i< b;i++) { for(int j=i+1;j< b;j++) { int juli=(ax[i]-ax[j])*(ax[i]-ax[j])+(ay[i]-ay[j])*(ay[i]-ay[j]); p[i][j]=p[j][i]=juli; } } int a=Integer.parseInt(in.readLine()); for(int i=0;i< a;i++) { ss=in.readLine().split(" "); int u1=Integer.parseInt(ss[0])-1; int u2=Integer.parseInt(ss[1])-1; p[u1][u2]=p[u2][u1]=0; } int[] low=new int[b]; low[0]=-1; int[] near=new int[b]; for(int i=1;i< b;i++) low[i]=p[0][i]; for(int i=1;i< b;i++) { int min=9999999,tag=0; for(int j=0;j< b;j++) { if(low[j]!=-1&&low[j]< min) { min=low[j]; tag=j; } } if(min!=0) System.out.println((near[tag]+1)+" "+(tag+1)); low[tag]=-1; for(int j=0;j< b;j++) { if(p[tag][j]< low[j]) { low[j]=p[tag][j]; near[j]=tag; } } } } }
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