PAT——A1076 Forwards on Weibo

题目链接:

#include<cstdio>
#include<iostream>
#include<cmath>
#include<algorithm>
#include<vector>
#include<cstring>
#include<map>
#include<queue>
using namespace std;
const int MAXV=1010;
struct Node{
    int id;
    int layer;
};
vector<Node>Adj[MAXV];
bool inq[MAXV]={false};
int BFS(int s,int L)
{
    int numForward=0;
    queue<Node>q;
    Node start;
    start.id=s;
    start.layer=0;
    q.push(start);
    inq[start.id]=true;
    while(!q.empty())
    {
        Node topNode=q.front();
        q.pop();
        int u=topNode.id;
        for(int i=0;i<Adj[u].size();i++)
        {
            Node next=Adj[u][i];
            next.layer=topNode.layer+1;
            if(inq[next.id]==false&&next.layer<=L)
            {
               q.push(next);
               inq[next.id]=true;
               numForward++;
            }
        }
    }
    return numForward;
}
int main()
{
    Node user;
    int n,L,numFollow,idFollow;
    scanf("%d%d",&n,&L);
    for(int i=1;i<=n;i++)
    {
        user.id=i;
        scanf("%d",&numFollow);
        for(int j=0;j<numFollow;j++)
        {
            scanf("%d",&idFollow);
            Adj[idFollow].push_back(user);
        }
    }
    int numQuery,s;
    scanf("%d",&numQuery);
    for(int i=0;i<numQuery;i++)
    {
        memset(inq,false,sizeof(inq));
        scanf("%d",&s);
        int numForward=BFS(s,L);
        printf("%d\n",numForward);
    }
    return 0;
}

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转载自blog.csdn.net/qq_42232118/article/details/82382617
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