Submission #828078

#	Time	Username	Problem	Language	Result	Execution time	Memory
828078		minhcool	Stations (IOI20_stations)	C++17	8 / 100	643 ms	28064 KiB

stations

#include "stations.h"
#include<bits/stdc++.h>
using namespace std;
#include <vector>
 
#define pb push_back
 
const int N = 5e5 + 5;
 
int n;
vector<int> Adj[N];
 
int l[N], r[N];
 
vector<int> vis;
 
void dfs(int u, int p){
	l[u] = vis.size();
	vis.pb(u);
	for(auto v : Adj[u]){
		if(v == p) continue;
		dfs(v, u);
	}
	r[u] = vis.size();
}
 
//vector<int> vis;
 
int tol[1005][1005];
 
void prep(){
	int cnt = 0;
	for(int i = 0; i < n; i++){
		for(int j = i + 1; j < n; j++){
			tol[i][j] = cnt;
			cnt++;
		}
	}
}
 
vector<int> label(int n_, int k, vector<int> u, vector<int> v) {
	prep();
	n = n_;
	vis.clear();
	for(int i = 0; i < n; i++) Adj[i].clear();
	for(int i = 0; i < (n - 1); i++){
		Adj[u[i]].pb(v[i]); Adj[v[i]].pb(u[i]);
	}
	dfs(0, 0);
	vector<int> labels(n);
	for(int i = 0; i < n; i++){
		labels[i] = i;
	}
	return labels;
	/*
	std::vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = i;
	}
	return labels;*/
}
 
bool anc(int x, int y){
    if(x == 0) return 1;
    if(x == y) return 1;
	while(y){
    	y = (y - 1) / 2;
        if(x == y) return 1;
    }
    return 0;
}
 
int find_next_station(int s, int t, vector<int> c) {
	//cout << c.size() << "\n";
	//return 0;
	if(c.size() == 1) return c[0];
	int temp = c.size();
	for(int i = temp - 1; i >= 0; i--){
		//if(!i) cout << "OK ";
		//cout << temp << " " << i << " " << c[i] << " " << t << "\n";
		if(anc(c[i], t)) return c[i];
		//if(!i) break;
	}
    return c[0];
	/*
	if(anc(c[1], t)) return c[1];
    else if(anc(c[2], t)) return c[2];
    else return c[0];*/
	//return c[0];
}

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