Submission #772445

#	Time	Username	Problem	Language	Result	Execution time	Memory
772445		SanguineChameleon	Stations (IOI20_stations)	C++17	0 / 100	3 ms	456 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 t = -1;

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

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for (int i = 0; i < n - 1; i++) {
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}
	//dfs(0, -1);
	vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = tin[i] * 1000 + tout[i];
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	int tin_s = s / 1000;
	int tout_s = s % 1000;
	int tin_t = t / 1000;
	int tout_t = t % 1000;
	int par = -1;
	for (auto u: c) {
		int tin_u = u / 1000;
		int tout_u = u % 1000;
		if (tin_u <= tin_s && tout_s <= tout_u) {
			par = u;
		}
		else if (tin_u <= tin_t && tout_t <= tout_u) {
			return u;
		}
	}
	return par;
}

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