Submission #1229005

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229005		trimkus	Stations (IOI20_stations)	C++20	0 / 100	307 ms	532 KiB

stations

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



std::vector<int> label(int n, int k, std::vector<int> U, std::vector<int> V) {
	vector<vector<int>> adj(n);
	for (int i = 0; i < (int)U.size(); ++i) {
		adj[U[i]].push_back(V[i]);
		adj[V[i]].push_back(U[i]);
	}
	vector<int> tin(n), tout(n);
	auto dfs = [&](auto& dfs, int i, int p, int& t) -> void {
		tin[i] = t++;
		for (auto& u : adj[i]) {
			if (p == u) continue;
			dfs(dfs, u, i, t);
		}
		tout[i] = t;
	};
	int t = 0;
	dfs(dfs, 0, -1, t);
	vector<int> rt(n);
	for (int i = 0; i < n; ++i) {
		rt[i] = tin[i] * 1000 + tout[i];
	}
	return rt;
}

bool ancestor(int t1, int t2, int tt1, int tt2) {
	return t1 <= tt1 && tt2 <= t2;
}

int find_next_station(int s, int t, std::vector<int> c) {
	int ent1 = t / 1000;
	int ent2 = t % 1000;
	for (auto& i : c) {
		int t1 = i / 1000;
		int t2 = i % 1000;
		if (ancestor(ent1, ent2, t1, t2)) {
			return i;
		}
	}
	int st1 = s / 1000;
	int st2 = s % 1000;
	for (auto& i : c) {
		int t1 = i / 1000;
		int t2 = i % 1000;
		if (ancestor(st1, st2, t1, t2)) {
			return i;
		}
	}
	assert(false);
	return -1;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61