HDU1285确定比赛名次(拓扑排序)

题目链接

解题报告：

这题小意思。。啦 啦啦

#include <stdio.h>
#include <string.h>

#define MAXN 600

int n, m, indegree[MAXN], G[MAXN][MAXN], q[MAXN];

int toposort(){
    int i, j, k;
    i=0;
    while(i<n){
        for(j=1; j<=n; j++){
            if(indegree[j] == 0){
                indegree[j]--;
                q[i++] = j;
                for(k=1; k<=n; k++) if(G[j][k]) indegree[k]--;
                break;
            }
        }
    }

    return 1;
}

int main(){
    int i, a, b;
    while(scanf("%d%d", &n, &m) == 2){
        memset(G, 0, sizeof(G));
        memset(indegree, 0, sizeof(indegree));

        for(i=1; i<=m; i++){
            scanf("%d %d", &a, &b);
            if(G[a][b] == 0){
                G[a][b] = 1;
                indegree[b]++; 
            }

        }
        toposort();
        for(i=0; i<n; i++){
            if(i != n-1) printf("%d ", q[i]);
            else printf("%d\n", q[i]);
        }
    }
    return 0;
}