Submission #432285

#	Time	Username	Problem	Language	Result	Execution time	Memory
432285		Mlxa	Stations (IOI20_stations)	C++14	100 / 100	952 ms	732 KiB

stations

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) x.begin(), x.end()
#define mp make_pair
#define mt make_tuple
#define x first
#define y second
#include "stations.h"

vector<int> label(int n, int k, vector<int> eu, vector<int> ev) {
	assert(k >= n - 1);
	vector<int> labels(n), order;
	vector<vector<int>> g(n);
	for (int i = 0; i < n - 1; ++i) {
		g[ev[i]].push_back(eu[i]);
		g[eu[i]].push_back(ev[i]);
	}
	function<void(int, int, bool)> dfs = [&](int v, int p, bool in) {
		if (in) {
			order.push_back(v);
		}
		for (int u : g[v]) {
			if (u != p) {
				dfs(u, v, !in);
			}
		}
		if (!in) {
			order.push_back(v);
		}
	};
	dfs(0, 0, 1);
	for (int i = 0; i < n; ++i) {
		labels[order[i]] = i;
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	assert(is_sorted(all(c)));
	assert(s != t);
	if (c.size() == 1) {
		return c[0];
	}
	if (c[0] < s) {
		assert(c.back() < s);
		if (t < c.front()) {
			return c.front();
		}
		for (int i = 0; i + 1 < (int)c.size(); ++i) {
			if (c[i] <= t && t < c[i + 1]) {
				return c[i];
			}
		}
		if (c.back() <= t && t < s) {
			return c.back();
		}
		assert(t > s);
		return c[0];
	} else {
		assert(c.front() > s);
		if (t < s) {
			return c.back();
		}
		for (int e : c) {
			if (t <= e) {
				return e;
			}
		}
		return c.back();
	}
}

#ifdef LC
#include "stub.cpp"
#endif

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