제출 #1147822

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1147822		yeyso	9월 (APIO24_september)	C++20	0 / 100	0 ms	324 KiB

september

#include "september.h"
#include <bits/stdc++.h>
using namespace std;
void dfs(int u, int v, vector<vector<int>> &adj, unordered_set<int> &disconnected, vector<bool> &cleared){
	if(cleared[u]){
		disconnected.insert(u);
		for(int i = 0; i < adj[u].size(); i ++){
			dfs(adj[u][i], u, adj, disconnected, cleared);
		}
	}
}
int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
	vector<vector<int>> adj(N, vector<int>());
	for(int i = 1; i < F.size(); i ++){
		adj[F[i]].push_back(i);
	}
	//vector<set<int>> disconnected(M, set<int>());
	//vector<set<int>> cleared(M, set<int>());

	unordered_set<int> disconnected[M];
	//unordered_set<int> cleared[M];
	vector<vector<bool>> cleared(M, vector<bool>(N, 0));
	int days = 0;
	for(int i = 0; i < S[0].size(); i ++){
		for(int j = 0; j < S.size(); j ++){
			dfs(S[j][i], 0, adj, disconnected[j], cleared[j]);
			disconnected[j].erase(S[j][i]);
			//cleared[j].insert(S[j][i]);
			cleared[j][S[j][i]] = 1;
		}
		int newday = 1;
		for(int j = 0; j < S.size(); j ++){
			if(!disconnected[j].empty()){
				newday = 0;
			}
			if(newday){
				if(j != 0){
					if(cleared[j] != cleared[j-1]){
						newday = 0;
					}
				}
			}
		}
		days += newday;	
	}
	return days;
}
/*
g++ -std=gnu++17 -O2 -o september stub.cpp september.cpp

1
5 2
0 0 2 2
3 4 1 2
4 3 2 1

*/

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