제출 #1151193

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1151193		TroySer	9월 (APIO24_september)	C++20	45 / 100	840 ms	18844 KiB

september

#include "september.h"
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int solve(int N, int M, vector<int> F, vector<vector<int> > S) {

	vector<vector<ll> > adjList;
	adjList.resize(N);

	for (ll i = 1; i < N; i++) {
		adjList[F[i]].push_back(i);
	}

	set<ll> beenBanished;
	vector<int> firstS = S[0];

	map<ll, ll> actualIndex;
	for (ll i = 0; i < N - 1; i++) {
		actualIndex[firstS[i]] = i;
	}

	ll banishmentIndex = 0;
	ll maxK = 1;

	for (ll i = 0; i < N - 1; i++) {

		// cout << firstS[i] << " " << i << ", " << banishmentIndex << endl;

		if (banishmentIndex < i) {
			maxK++;
		}

		queue<ll> bfsQueue;
		bfsQueue.push(firstS[i]);

		while (!bfsQueue.empty()) {

			ll currentIndex = bfsQueue.front();
			bfsQueue.pop();
			if (beenBanished.find(currentIndex) != beenBanished.end()) {
				continue;
			}

			beenBanished.insert(currentIndex);
			banishmentIndex = max(banishmentIndex, actualIndex[currentIndex]);

			for (ll v: adjList[currentIndex]) {
				bfsQueue.push(v);
			}

		}

	}

	return maxK;

}

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