Submission #978925

#	Time	Username	Problem	Language	Result	Execution time	Memory
978925		happypotato	Stations (IOI20_stations)	C++17	0 / 100	576 ms	884 KiB

stations

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

vector<int> label(int n, int k, vector<int> U, vector<int> V) {
	vector<vector<int>> adj(n);
	for (int i = 0; i < n - 1; i++) {
		adj[U[i]].pb(V[i]);
		adj[V[i]].pb(U[i]);
	}
	vector<int> res(n);
	int tt = 0;

	auto dfs = [&](auto&& self, int u = 0, int par = -1, bool flag = false) -> void {
		if (!flag) res[u] = ++tt;
		for (int v : adj[u]) {
			if (v == par) continue;
			self(self, v, u, flag ^ 1);
		}
		if (flag) res[u] = ++tt;
	};

	dfs(dfs);
	return res;
}

int find_next_station(int s, int t, vector<int> c) {
	if (c.size() == 1) return c.front();
	c.pb(s);
	sort(c.begin(), c.end());
	if (c.back() == s) {
		for (int i = 1; i < (int)(c.size()) - 1; i++) {
			if (c[i] <= t && t < c[i + 1]) return c[i];
		}
		return c.front();
	} else if (c.front() == s) {
		for (int i = 1; i < (int)(c.size()) - 1; i++) {
			if (c[i - 1] <= t && t < c[i]) return c[i];
		}
		return c.back();
	} else throw runtime_error("wrong construction");
}

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