Submission #719358

#	Time	Username	Problem	Language	Result	Execution time	Memory
719358		mseebacher	Stations (IOI20_stations)	C++17	0 / 100	864 ms	548 KiB

stations

#include "stations.h"
#include <bits/stdc++.h> 

using namespace std;

#define MAXI (int)1e3+10

vector<int> ad[MAXI];
vector<int> labels;


// 1 .. 1e3
// 1e3+1 ... 2e3
void dfs(int x,int e){
	if(e > 0){
		labels[x] = labels[e]+1;
	}
	int cnt = 0;
	for(auto s: ad[x]){
		if(s == e) continue;
		if(x == 0 && e == -1){
			labels[s] = cnt*1000;
			cnt++;
		}
		dfs(s,x);
	}
}


vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	labels.assign(n,0);
	for(int i = 0;i<MAXI;i++) ad[i].clear();
	
	for(int i = 0;i<n-1;i++){
		ad[u[i]].push_back(v[i]);
		ad[v[i]].push_back(u[i]);
	}
	int start = 0;
	for(int i = 0;i<n;i++){
		if(ad[i].size() >= 3){
			start = i;
			break;
		}
	}
	labels[start] = 1e6;
	dfs(start,-1);
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if(s == 1e6){
		for(int i = 0;i<(int)c.size();i++){
			if(abs(c[i]-t) < (int)1e3) return c[i];
		}
	}else{
		if((s/1000)*1000 == (t/1000)*1000){
			return t > s ? c[1] : c[0];
		}else return c[0];
	}
	return c[0];
}

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