• 2016年天梯赛模拟 5-14 喊山


     1 #include<stack>
     2 #include<queue>
     3 #include<cmath>
     4 #include<vector>
     5 #include<cstdio>
     6 #include<cstring>
     7 #include<iostream>
     8 #include<algorithm>
     9 using namespace std;
    10 #define inf 99999
    11 int n,m,k;
    12 vector<int>G[10002];
    13 queue<int>q;
    14 typedef struct
    15 {
    16     int id,l;
    17 }d;
    18 d dis[10002];
    19 
    20 bool cmp(d a, d b)
    21 {
    22     return a.l < b.l;
    23 }
    24 
    25 int spfa(int x)
    26 {
    27     while(!q.empty()) q.pop();
    28     bool inq[10002];
    29     for(int i=1;i<=n;i++) {dis[i].l = inf;dis[i].id = i;}
    30     memset(inq,false,sizeof(inq));
    31     dis[0].l = -1;
    32     dis[x].l = 0;
    33     inq[x] = true;
    34     q.push(x);
    35     while(!q.empty())
    36     {
    37         int u = q.front(); q.pop(); inq[u] = false;
    38         for(int i=0;i<G[u].size();i++)
    39         {
    40             int v = G[u][i];
    41             if(dis[u].l + 1 < dis[v].l)
    42             {
    43                 dis[v].l = dis[u].l + 1;
    44                 if(!inq[v]){
    45                     inq[v] = true;
    46                     q.push(v);
    47                 }
    48             }
    49         }
    50     }
    51     sort(dis,dis+n+1,cmp);
    52 
    53     int max1,ans;
    54     for(int i=n;i>=1;i--)
    55     {
    56         if(dis[i].l == inf){
    57             continue;
    58         }
    59         else{
    60             max1 = dis[i].l;
    61             ans = i;
    62             break;
    63         }
    64     }
    65 
    66     for(int i=ans - 1;i>=1;i--)
    67     {
    68         if(dis[i].l != max1)
    69         {
    70             return dis[i+1].id;
    71         }
    72     }
    73 
    74 }
    75 
    76 int main()
    77 {
    78     int x,y;
    79     scanf("%d%d%d",&n,&m,&k);
    80     for(int i=0;i<m;i++)
    81     {
    82         scanf("%d%d",&x,&y);
    83         G[x].push_back(y);
    84         G[y].push_back(x);
    85     }
    86     for(int i=1;i<=k;i++)
    87     {
    88         int qu;
    89         scanf("%d",&qu);
    90         if(G[qu].size() == 0)
    91         {
    92             printf("0
    ");
    93             continue;
    94         }
    95         printf("%d
    ",spfa(qu));
    96     }
    97 }
    View Code
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  • 原文地址:https://www.cnblogs.com/NWUACM/p/6544762.html
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