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;
using vi = vector<int>;
int solve(int n,int m,vector<int> f,vector<vector<int>> s){
vector<vi> adj(n);
vi vis(n);
for(int i=1;i<n;i++)adj[f[i]].emplace_back(i);
int cnt=0;
function<void(int)> dfs=[&](int u){
if(vis[u])return;
vis[u]=true,cnt++;
for(auto v:adj[u])dfs(v);
};
int ans=0;
for(int i=0;i<n-1;i++){
for(int j=0;j<m;j++)dfs(s[j][i]);
ans+=--cnt==0;
}
return ans;
}
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