제출 #1035320

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1035320		LaviniaTornaghi	9월 (APIO24_september)	C++17	0 / 100	1 ms	348 KiB

september

#include "september.h"
#include <bits/stdc++.h>
using namespace std;

int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
	assert(M == 1);
	
	vector<vector<int>> adj(N);
	for (int i = 1; i < N; i++)
		adj[F[i]].push_back(i);
	
	vector<vector<int>> inv_S(M, vector<int>(N));
	for (int i = 0; i < M; i++) {
		for (int j = 0; j < N; j++) {
			inv_S[i][S[i][j]] = j;
		}
	}

	vector<bool> visited(N);
	auto dfs = [&](auto &&dfs, int node) -> int {
		if (visited[node])
			return -1;
		visited[node] = true;
		
		int ans = inv_S[0][node];
		for (auto x: adj[node])
			ans = max(ans, dfs(dfs, x));
		
		return ans;
	};

	int curr_l = 0, k = 0;
	while (curr_l != N) {
		k++;
		
		int curr_r = curr_l + 1;
		for (; curr_l < curr_r; curr_l++) {
			curr_r = max(curr_r, dfs(dfs, curr_l));
		}
	}

	return k;
}

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