제출 #1241390

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1241390		dosts	참나무 (IOI23_beechtree)	C++20	0 / 100	3 ms	6472 KiB

beechtree

#include "beechtree.h"
#include <bits/stdc++.h>
//#define int long long
#define pii pair<int,int> 
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " << 
#define all(x) x.begin(),x.end()
using namespace std;

const int LIM = 2e5+1;
vector<pii> edges[LIM];
vi ans(LIM,0),C,P;

int N;
vi ctr(LIM,0);


bool check(int node) {
    for (auto it : edges[node]) {
        ctr[it.ss] = 0;
    }
    for (auto it : edges[node]) {
        if (ctr[it.ss]) return false;
        ctr[it.ss]++;
    }
    if (node) return true;
    for (auto it : edges[node]) if (!check(it.ff)) return false;    
    sort(all(edges[node]),[&](pii a,pii b) {
        return edges[a.ff].size() > edges[b.ff].size();
    });
    ctr.assign(N,0);
    for (int i = 0;i<N;i++) ctr[C[i]]++;
    for (int i = 0;i<edges[node].size();i++) {
        for (auto it : edges[edges[node][i].ff]) {
            if (ctr[C[it.ff]] < i+1) return false;
        }
    }
    return true;
}


int dfs(int node) {
    for (auto it : edges[node]) dfs(it.ff);
   return  ans[node] = check(node);
}

std::vector<int> beechtree(int N_, int M, std::vector<int> P_, std::vector<int> C_)
{
    N = N_;
    P = P_,C = C_;
    ans.assign(N_,0);
    for (int i = 0;i<N;i++) edges[i].clear(); 
    vi v;
    for (auto it : C) v.push_back(it);
    sort(all(v));
    v.erase(unique(all(v)),v.end());
    for (auto& it : C) it = lower_bound(all(v),it)-v.begin();
    for (int i = 1;i<N;i++) {
        edges[P[i]].push_back({i,C[i]});
    }
    dfs(0);
    return ans;
}

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