http://poj.org/problem?id=3687 /* @author: */ import java.util.Scanner; import java.util.Arrays; public class Main{ int degree[]=new int[210]; boolean visit[][]=new boolean[210][210]; int path[]=new int[210]; int n,m,t; void topsort(){ for(int k=n;k>=1;k--){ int i=n; while(i>=1 && degree[i]!=0) i--; if(i< 1){ System.out.printf("-1n"); return; } degree[i]=-1; path[i]=k; for(int x=1;x<=n;x++) if(visit[x][i]) degree[x]--; } for(int j=1;j<=n;j++) System.out.printf("%d ",path[j]); System.out.printf("n"); } public void doit(){ Scanner sc=new Scanner(System.in); int x,y; t=sc.nextInt(); while((t--)!=0){ n=sc.nextInt(); m=sc.nextInt(); Arrays.fill(degree,0); for(int i=0;i< visit.length;i++) Arrays.fill(visit[i],false); for(int i=1;i<=m;i++){ x=sc.nextInt(); y=sc.nextInt(); if(!visit[x][y]){ visit[x][y]=true; degree[x]++; } } topsort(); } } public static void main(String args[]){ Main m=new Main(); m.doit(); } }
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