Submission #772526

#	Time	Username	Problem	Language	Result	Execution time	Memory
772526		SanguineChameleon	Stations (IOI20_stations)	C++17	76 / 100	771 ms	804 KiB

stations

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

const int maxn = 1e3 + 20;
vector<int> adj[maxn];
int tin[maxn];
int tout[maxn];
int depth[maxn];
int dfs_t;

void dfs(int u, int p) {
	tin[u] = ++dfs_t;
	for (auto v: adj[u]) {
		if (v != p) {
			depth[v] = depth[u] + 1;
			dfs(v, u);
		}
	}
	tout[u] = ++dfs_t;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for (int i = 0; i < n; i++) {
		adj[i].clear();
	}
	for (int i = 0; i < n - 1; i++) {
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}
	dfs_t = -1;
	dfs(0, -1);
	vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = (depth[i] & 1 ? tout[i] : tin[i]);
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	sort(c.begin(), c.end());
	if (s < c[0]) {
		for (int i = 0; i < (int)c.size() - 1; i++) {
			if ((i ? c[i - 1] : s) < t && t <= c[i]) {
				return c[i];
			}
		}
		return c.back();
	}
	else {
		for (int i = 1; i < (int)c.size(); i++) {
			if (c[i] <= t && t < (i < (int)c.size() - 1 ? c[i + 1] : s)) {
				return c[i];
			}
		}
		return c[0];
	}
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 50 / 61