A. Party

合集 - 树论(34)

1.P3478 [POI2008] STA-Station2024-03-192.E1. Weights Division (easy version)2024-03-223.P5007 DDOSvoid 的疑惑2024-03-254.P2168 [NOI2015] 荷马史诗2024-03-305.P8306 【模板】字典树2024-03-306.P1481 魔族密码2024-03-307.P3128 [USACO15DEC] Max Flow P2024-04-028.P3258 [JLOI2014] 松鼠的新家2024-04-029.P5536 【XR-3】核心城市2024-04-0210.P5836 [USACO19DEC] Milk Visits S2024-04-0211.P3384 【模板】重链剖分/树链剖分2024-04-0312.P3038 [USACO11DEC] Grass Planting G2024-04-0313.P4551 最长异或路径2024-04-0414.F. Alex's whims2024-04-1215.J. 上学2024-05-1416.Game on Tree2024-05-1417.E. We Need More Bosses2024-05-15

18.A. Party2024-05-15

19.D. Strong Vertices2024-05-1620.B. Omkar and Heavenly Tree2024-05-1621.B. Mahmoud and Ehab and the bipartiteness2024-05-1622.P8655 [蓝桥杯 2017 国 B] 发现环2024-05-2423.P10298 [CCC 2024 S4] Painting Roads2024-05-2424.F. Gardening Friends2024-06-1425.D. Playoff Tournament2024-06-1926.E. Lomsat gelral2024-07-1227.F. Minimum Maximum Distance2024-07-1428.D. Book of Evil2024-07-1529.P2195 HXY造公园2024-07-1530.P3304 [SDOI2013] 直径2024-07-1531.D. Sasha and a Walk in the City2024-07-1932.D. Vitaly and Cycle2024-08-0133.P10838 『FLA - I』庭中有奇树2024-08-0734.F - Perfect Matching on a Tree2024-08-10

收起

原题链接

题解

1.多根树结构，但是将-1的点设为0的子节点，就变成了单根树
2.仔细读题！！！只要同一链上的就不能在一个组里

code

#include<bits/stdc++.h>
using namespace std;
int depth[2005]={0};
vector<int> G[2005];
void dfs(int now)
{
    for(auto next:G[now])
    {
        depth[next]=depth[now]+1;
        dfs(next);
    }
}
int main()
{
    int n;
    cin>>n;

    for(int i=1;i<=n;i++)
    {
        int x;
        cin>>x;
        if(x==-1) x++;
        G[x].push_back(i);
    }
    dfs(0);
    int ans=0;
    for(int i=1;i<=n;i++) ans=max(ans,depth[i]);
    cout<<ans;
    return 0;
}