제출 #912668

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
912668		Ludissey	참나무 (IOI23_beechtree)	C++17	9 / 100	62 ms	17492 KiB

beechtree

#include "beechtree.h"
#include <bits/stdc++.h>
using namespace std;
int N,M;
vector<vector<int>> child;
vector<int> C;
vector<int> P;
vector<int> outp;
 
 
std::vector<int> beechtree(int n, int m, std::vector<int> p, std::vector<int> c)
{
    N=n; M=m;
    C.assign(c.begin(), c.end());
    P.assign(p.begin(), p.end());
    child.resize(n);
    outp.resize(n,0);
    for (int i = 1; i < N; i++) child[P[i]].push_back(i);
    bool df=true;
    outp[0]=1;
    vector<pair<int,int>> childr;
    unordered_set<int> ccolors;
    for (int i = 1; i < n; i++)
    {
        if(P[i]==0){
            childr.push_back({child[i].size(),i});
            unordered_set<int> clors;
            if(ccolors.find(c[i])!=ccolors.end()) outp[0]=0;
            ccolors.insert(c[i]);
            outp[i]=1;
            for (auto u : child[i]) 
            {
                if(clors.find(c[u])!=clors.end()) { outp[i]=0; df=false; break; } // la couleur est la meme dans un arbre
                clors.insert(c[u]);
            }
        }   
        else if(child[i].size()==0) outp[i]=1;
    }
    if(!df) { outp[0]=0; return {outp}; }
    sort(childr.begin(), childr.end(),greater<pair<int,int>>());
    unordered_set<int> colors;
    for (int i = 0; i < (int)child[0].size(); i++) colors.insert(c[child[0][i]]); // la couleur est la meme dans un arbre
    for (int i = 0; i < (int)childr.size(); i++)
    {
        unordered_set<int> colors2;
        for (auto u : child[childr[i].second]) 
        {
            if(colors.find(c[u])==colors.end()) { outp[0]=0; break; } // color in subtree is not in other tree
            colors.insert(c[u]);
            colors2.insert(c[u]);
        }
        colors.clear();
        colors=colors2;
        if(outp[0]==0) break;
    }
    
    return {outp};
}

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