제출 #760807

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
760807		pakapu	Regions (IOI09_regions)	C++17	0 / 100	60 ms	27664 KiB

regions

#include <bits/stdc++.h>

using namespace std;

int dfs(int u, int cnt, const vector<vector<int>> &g,
		const vector<int> &r, const int r1, const int r2) {
	int rt = 0;
	if(r[u] == r1) {
		cnt++;
	}
	if(r[u] == r2) {
		rt += cnt;
	}

	for(auto v : g[u]) {
		rt += dfs(v, cnt, g, r, r1, r2);
	}

	return rt;
}

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int n, nr, q;
	cin >> n >> nr >> q;

	vector<int> a(n);
	vector<int> r(n);
	vector<vector<int>> g(n);

	cin >> r[0];
	for(int i = 1; i < n; i++) {
		int from;
		cin >> from;
		from--;
		g[from].push_back(i);
		cin >> r[i];
	}

	for(int query = 1; query <= q; query++) {
		int r1, r2;
		cin >> r1 >> r2;

		cout << dfs(0, 0, g, r, r1, r2) << '\n';
	}

	return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 85