Submission #1292801

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292801		lambd47	Stations (IOI20_stations)	C++20	0 / 100	398 ms	516 KiB

stations

#include<bits/stdc++.h>
using namespace std;
#define L(i,j,k) for(int i=(j);i<=(k);i++)
#define R(i,j,k) for(int i=(j);i>=(k);i--)
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(),(v).end()
#include "stations.h"

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	std::vector<int> dp(n);
	vector<vector<int>> adj(n);
	L(i,0,n-2){
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}
	int tempo=0;

	auto dfs=[&](auto&& self, int node,int pai, int tipo)->void{
		if(tipo==0){
			dp[node]=tempo*2;
			tempo++;
		}
		int x=0;
		for(auto a:adj[node]){
			if(a==pai)continue;
			self(self,a,node,tipo^1);
		}
		if(tipo==1){
			dp[node]=tempo*2+1;
			tempo++;
		}
	};
	dfs(dfs,0,0,0);
	return dp;
}

int find_next_station(int s, int t, std::vector<int> c) {
	int n=sz(c);
	int tipo=s%2;
	s/=2;
	t/=2;
	L(i,0,n-1)c[i]/=2;
	if(tipo==0){//marca tempo de entrada e filhos tempo de saida
		if(s==0){
			int id=0;
			while(c[id]<t)id++;
			return 2*c[id]+1;
		}
		else{
			int pai=c.back();
			//vejo se ta dentro do s
			if(t<s || t>c[n-2])return 2*pai+1;
			int id=0;
			while(c[id]<t)id++;
			return 2*c[id]+1;
		}
	}
	else{
		int pai=c[0];
		int id=n-1;
		if(t<c[1] || t>s)return 2*pai;
		while(c[id]>t)id--;
		return 2*c[id];

	}

}

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