Submission #1099237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099237		huyngo	Keys (IOI21_keys)	C++17	0 / 100	2 ms	348 KiB

keys

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

std::vector<int> find_reachable(std::vector<int> r, std::vector<int> u, std::vector<int> v, std::vector<int> c) {
	std::vector<int> ans(r.size(), 1);
	int n = r.size();
	int m = u.size();
	vector<vector<array<int, 2>>> adj(n);
	vector<vector<int>> pend(n);
	for (int i = 0; i < m; ++i) {
		adj[u[i]].push_back({ v[i], c[i] });
		adj[v[i]].push_back({ u[i], c[i] });
	}

	vector<int> reachable(n);
	for (int st = 0; st < n; ++st) {
		queue<int> qu;
		qu.push(st);
		vector<bool> unlock(n, false), vis(n, false);
		while (qu.size()) {
			int u = qu.front(); qu.pop();
			vis[u] = true;
			++reachable[st];
			unlock[r[u]] = 1;
			for (int v : pend[r[u]])
				if (!vis[v])
					qu.push(v);
			pend[r[u]].clear();
			for (auto [v, w] : adj[u]) if (!vis[v]) {
				if (unlock[w])
					qu.push(v);
				else
					pend[w].push_back(v);
			}
		}
	}
	int _min = *min_element(reachable.begin(), reachable.end());
	for (int i = 0; i < n; ++i)
		ans[i] = (reachable[i] == _min);
	return ans;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33