Submission #1296383

#	Time	Username	Problem	Language	Result	Execution time	Memory
1296383		kawhiet	Stations (IOI20_stations)	C++20	16 / 100	396 ms	532 KiB

stations

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

vector<int> a;
vector<vector<int>> g;

void dfs(int u, int p) {
	a.push_back(u);
	for (auto v : g[u]) {
		if (v != p) {
			dfs(v, u);
		}
	}
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	g.assign(n, {});
	for (int i = 0; i < n - 1; i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	int r = -1, mx = 0;
	for (int i = 0; i < n; i++) {
		if (g[i].size() > mx) {
			mx = g[i].size();
			r = i;
		}
	}
	vector<int> ret(n);
	ret[r] = 0;
	int cur = 1;
	for (auto u : g[r]) {
		int x = cur;
		int p = r;
		while (true) {
			ret[u] = x;
			x += g[r].size();
			bool has = 0;
			for (auto v : g[u]) {
				if (v != p) {
					has = 1;
					p = u;
					u = v;
					break;
				}
			}
			if (!has) break;
		}
		cur++;
	}
	return ret;
}

int find_next_station(int s, int t, vector<int> c) {
	if (s == 0) {
		int r = c.size();
		for (auto x : c) {
			if (t % r == x) {
				return x;
			}
		}
	}
	int r = 0;
	for (auto x : c) {
		if (x != 0) {
			r = abs(s - x);
		}
	}
	if (r == 0) return 0;
	if (s % r == t % r) {
		if (s < t) {
			return s + r;
		} else {
			return s - r;
		}
	} else {
		for (auto x : c) {
			if (x == s - r) {
				return x;
			}
		}
		return 0;
	}
}

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