제출 #1160173

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1160173		pensive	9월 (APIO24_september)	C++20	0 / 100	3 ms	5188 KiB

september

#include "september.h"
#include <unordered_set>
#include <vector>


using namespace std;
#define REP(a,i,n) for (int i=a;i<n;i++)
unordered_set<int> leafed;
vector<vector<int>> childs(200001);
int freq[200001], visited[200001];

void loadChildren(int N, vector<int> F) {
	REP(1,i,N) {
		childs[F[i]].push_back(i);
	}
}

void including(int parent) {
	visited[parent]=1;
	leafed.insert(parent);
	for (auto leaf : childs[parent]) {
		if (!visited[leaf]) {
			including(leaf);
		}
	}
}

int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
	int K=0;
	loadChildren(N, F);

	REP(0,i,N-1) {
		REP(0, log, M) {
			int leaf = S[log][i];
			freq[leaf]++;
			if (!visited[leaf]) {
				including(leaf);
			}
			if (freq[leaf]>=M) {
				leafed.erase(leaf);
			}
		}
		if (leafed.size()==0) {
			K++;
		}
	}
	return K;
}

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