http://poj.org/problem?id=3194 /* @author: */ import java.util.Scanner; import java.util.Arrays; public class Main{ static int p[][]=new int[105][105]; static int q[][]=new int[101][101]; static int n,cnt; static void dfs(int i,int j) { if(i>n||j>n||i< 1||j< 1) return; q[i][j]=cnt; if(q[i][j+1]==0&&p[i][j]==p[i][j+1]) dfs(i,j+1); if(q[i][j-1]==0&&p[i][j]==p[i][j-1]) dfs(i,j-1); if(q[i+1][j]==0&&p[i][j]==p[i+1][j]) dfs(i+1,j); if(q[i-1][j]==0&&p[i][j]==p[i-1][j]) dfs(i-1,j); } public static void main(String args[]) { Scanner sc=new Scanner(System.in); int i,j,u,v; while(sc.hasNext()) { n=sc.nextInt(); if(n==0) break; for(i=0;i< p.length;i++){ Arrays.fill(p[i],0); } for(i=0;i< q.length;i++){ Arrays.fill(q[i],0); } for(i=0;i< n-1;i++) { for(j=0;j< n;j++) { u=sc.nextInt(); v=sc.nextInt(); p[u][v]=i+1; } } cnt=1; for(i=1;i<=n;i++) { for(j=1;j<=n;j++) { if(q[i][j]!=0) continue; dfs(i,j); cnt++; } } cnt--; if(cnt>n) System.out.println("wrong"); else System.out.println("good"); } } }
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