HDU 4857 topological_sort

标签：des   java   os   io   数据   for   2014   amp   

BestCoder Round #1

/**********************************************

      author   :    Grant Yuan
      time     :    2014.7.29
      algorithm:    topological_sort
      source   :    HDU 4857

**********************************************/

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<vector>
#include<stack>
#include<queue>
#define MAX 30007
using namespace std;

int n,m;
priority_queue<int> q;
vector<int> G[MAX];
int num[MAX];
int lu[MAX];

int main()
{   int a,b,t;
     scanf("%d",&t);
    while(t--){
        memset(lu,0,sizeof(lu));
        memset(num,0,sizeof(num));
        scanf("%d%d",&n,&m);
        memset(G,0,sizeof(G));
        while(!q.empty()){
            q.pop();
            }
        for(int i=1;i<=m;i++)
        {
            scanf("%d%d",&a,&b);
            G[b].push_back(a);
            num[a]++;

        }

        for(int i=1;i<=n;i++)
        {
            if(num[i]==0)
                q.push(i);
        }
        int i;int p=n;
        while(1){
                if(q.empty())
                    break;
                i=q.top();
                q.pop();
                lu[p--]=i;
                for(int j=0;j<G[i].size();j++)
                {
                  num[G[i][j]]--;
                  if(num[G[i][j]]==0)
                    q.push(G[i][j]);
                }
        }
        for(int i=1;i<=n;i++)
        {
            if(i<n) printf("%d ",lu[i]);
            else printf("%d",lu[i]);
        }
        printf("\n");
    }
    return 0;
}

HDU 4857 topological_sort,布布扣,bubuko.com

HDU 4857 topological_sort

标签：des   java   os   io   数据   for   2014   amp   

原文地址：http://blog.csdn.net/yuanchang_best/article/details/38299367