이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include"september.h"
#include<bits/stdc++.h>
using namespace std;
int solve(int n,int m,vector<int> f,vector<vector<int>> s){
vector<vector<int>> adj(n);
for(int i=1;i<n;i++)adj[f[i]].emplace_back(i);
vector<vector<bool>> vis(n,vector<bool>(m));
vector<bool> added(n);
vector<int> cnt(n);
multiset<int> ms;
function<void(int,int)> dfs=[&](int u,int i){
if(vis[u][i])return;
vis[u][i]=true;
if(!added[u]){
added[u]=true;
for(int i=0;i<m;i++)ms.emplace(u);
}
for(auto v:adj[u])dfs(v,i);
};
int ans=0;
for(int i=0;i<n-1;i++){
for(int j=0;j<m;j++)dfs(s[j][i],j);
for(int j=0;j<m;j++)ms.erase(ms.find(s[j][i]));
ans+=ms.empty();
}
return ans;
}
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