제출 #887636

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
887636		TAhmed33	Jail (JOI22_jail)	C++98	0 / 100	17 ms	6088 KiB

jail

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 120025;
vector <int> adj[MAXN];
vector <int> adj2[501];
int n, m;
int l[501], r[501], deg[501];
vector <int> dd[MAXN];
bool dfs (int pos, int par, int c) {
	if (pos == r[c]) {
		dd[pos].push_back(c);
		return 1;
	}
	bool f = 0;
	for (auto i : adj[pos]) {
		if (i != par) {
			f |= dfs(i, pos, c);
		}
	}
	if (f) dd[pos].push_back(c);
	return f;
}
void reset () {
	for (int i = 1; i <= n; i++) {
		adj[i].clear();
		dd[i].clear();
	}
}
int main () {
	int t = 1; cin >> t;
	while (t--) {
		cin >> n;
		reset();
		for (int i = 1; i < n; i++) {
			int a, b;
			cin >> a >> b;
			adj[a].push_back(b);
			adj[b].push_back(a);
		}
		cin >> m;
		for (int i = 1; i <= m; i++) {
			deg[i] = 0; adj2[i].clear();
		}
		for (int i = 1; i <= m; i++) {
			cin >> l[i] >> r[i];
			dfs(l[i], -1, i);
		}
		for (int i = 1; i <= m; i++) {
			for (auto j : dd[r[i]]) {
				if (j != i) adj2[i].push_back(j);
			}
		}
		for (int i = 1; i <= m; i++) {
			for (auto j : adj2[i]) {
				deg[j]++;
			}
		}
		vector <int> d;
		queue <int> cur;
		for (int i = 1; i <= m; i++) {
			if (deg[i] == 0) {
				cur.push(i);
			}
		}
		while (!cur.empty()) {
			auto j = cur.front();
			cur.pop();
			d.push_back(j);
			for (auto z : adj2[j]) {
				deg[z]--;
				if (deg[z] == 0) cur.push(z);
			}
		}
		if ((int)d.size() != m) {
			cout << "No\n";
		} else {
			cout << "Yes\n";
		}
	}
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23