Submission #392978

#	Time	Username	Problem	Language	Result	Execution time	Memory
392978		REALITYNB	Stations (IOI20_stations)	C++14	10 / 100	1037 ms	620 KiB

stations

#include <bits/stdc++.h> 
#include "stations.h"
#define pii pair<int,int> 
#define in first 
#define out second
#define mp make_pair 
using namespace std; 

vector<int> label(int n ,int k , vector<int> u , vector<int> v){
	vector<int> ans(n) ; 
	vector<int> adj[n] ; 
	for(int i=0;i<n-1;i++) {
		adj[u[i]].push_back(v[i]) ; 
		adj[v[i]].push_back(u[i]) ; 
	}
	int tim = 0 ; 
	vector<int> inn(n) , outt(n) ; 
	function<void(int,int)> dfs = [&](int a, int p){
		inn[a]=tim++; 
		for(int x :adj[a]){
			if(x!=p){
				dfs(x,a) ; 
			}
		}
		outt[a]=++tim ; 
	}; 
	dfs(0,0) ; 
	for(int i=0;i<n;i++)
		ans[i]=inn[i]+((outt[i])<<10);
	return ans ; 
}
pii get(int x){
	return mp(x%(1<<10),(x>>10)) ; 
}
bool ancestor(pii s, pii b){
	return (s.in<=b.in&&b.out<=s.out); 
}
int find_next_station(int s ,int t, vector<int> ne){
	pii ss = get(s) , tt = get(t) ; 
	if(ancestor(ss,tt)^1){
		for(int x : ne){
			if(ancestor(get(x),ss)){
				return x ; 
			}
		}
	}
	for(int x : ne){
		if(ancestor(get(x),ss)^1 && ancestor(get(x),tt)){
			return x ; 
		}
	}
	if(s==t) return s ; 
	return 1 ; 
}
/*int main(){
	vector<int> u= {0,1,2} , v = {1,2,3} ;
	vector<int> res = label(4,1000000,u,v) ; 
	for(int x : res) cout << x <<" " ; 
	cout << endl ; 
	for(int i=0;i<4;i++){
		for(int j=0;j<4;j++){
			if(i!=j){
				cout << i << " "<< j << ": " << find_next_station(i,j,adj[i]) << endl ; 
			}
		}
	}
	return 0 ; 
}*/

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