确定比赛名次

Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other)

Total Submission(s) : 37   Accepted Submission(s) : 28

4 3
1 2
2 3
4 3

1 2 4 3

AC-code:

#include<cstdio>
#include<cstring>
int map[510][510],queue[510],indegree[510];
void topo(int n)
{
	int t=0,k,i,j;
	for(j=0;j<n;j++)
	{
		for(i=1;i<=n;i++)
		if(indegree[i]==0)
		{
			k=i;
			break;
		}
		queue[t++]=k;
		indegree[k]=-1;
		for(i=1;i<=n;i++)
			if(map[k][i])
				indegree[i]--;
	}
	printf("%d",queue[0]);
	for(i=1;i<n;i++)
		printf(" %d",queue[i]);
	printf("\n");
}
int main()
{
	int m,a,n,b;
	while(scanf("%d%d",&n,&m)!=EOF)
	{
		memset(map,0,sizeof(map));
		memset(indegree,0,sizeof(indegree));
		while(m--)
		{
			scanf("%d%d",&a,&b);
			if(map[a][b]==0)
			{
				indegree[b]++;
				map[a][b]=1;
			}	
		}
		topo(n);
	}
	return 0;
}

HDU 1285：确定比赛名次 【拓扑排序】

原文：http://blog.csdn.net/lin14543/article/details/47659257