1146. Topological Order (25)

青旅半醒 2022-05-28 08:24 109阅读 0赞

This is a problem given in the Graduate Entrance Exam in 2018: Which of the following is NOT a topological order obtained from the given directed graph? Now you are supposed to write a program to test each of the options.

![qp_p5m3xdiy3a6.jpg][]

**Input Specification:**

Each input file contains one test case. For each case, the first line gives two positive integers N (<= 1,000), the number of vertices in the graph, and M (<= 10,000), the number of directed edges. Then M lines follow, each gives the start and the end vertices of an edge. The vertices are numbered from 1 to N. After the graph, there is another positive integer K (<= 100). Then K lines of query follow, each gives a permutation of all the vertices. All the numbers in a line are separated by a space.

**Output Specification:**

Print in a line all the indices of queries which correspond to "NOT a topological order". The indices start from zero. All the numbers are separated by a space, and there must no extra space at the beginning or the end of the line. It is graranteed that there is at least one answer.

**Sample Input:**

6 8
    1 2
    1 3
    5 2
    5 4
    2 3
    2 6
    3 4
    6 4
    5
    1 5 2 3 6 4
    5 1 2 6 3 4
    5 1 2 3 6 4
    5 2 1 6 3 4
    1 2 3 4 5 6

**Sample Output:**

3 4

--------------------

题目大意：

代码：

#include<stdio.h>
    #include<vector>
    using namespace std;
    int Map[1010][1010];
    int dis[1010],dis1[1010];
    vector<int> v;
    int main()
    {
        int i,j,n,m,k,t,x,y,l;
        scanf("%d %d",&n,&m);
        for(i=0;i<m;i++)
        {
            scanf("%d %d",&x,&y);
            Map[x][y]=1;
            dis1[y]++;
        }
        scanf("%d",&k);
        for(i=0;i<k;i++)
        {
            int flag=0;
            for(j=1;j<=n;j++)
            {
                dis[j]=dis1[j];
            }
            for(j=0;j<n;j++)
            {
                scanf("%d",&t);
                if(dis[t]!=0)
                {
                    flag=1;
                }
                else
                {
                    for(l=1;l<=n;l++)
                    {
                        if(Map[t][l]==1)
                        {
                            dis[l]--;
                        }
                    }
                }
            }
            if(flag==1)
            {
                v.push_back(i);
            }
        }
            for(i=0;i<v.size();i++)
            {
                if(i==0)
                {
                    printf("%d",v[i]);
                }
                else
                {
                    printf(" %d",v[i]);
                }
            }
        return 0;
    }

[qp_p5m3xdiy3a6.jpg]: http://nos.patest.cn/qp_p5m3xdiy3a6.jpg