Submission #964631

#	Time	Username	Problem	Language	Result	Execution time	Memory
964631		irmuun	Stations (IOI20_stations)	C++17	76 / 100	605 ms	1708 KiB

stations

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

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

const int N=1e3+5;
vector<int>adj[N],tin(N),tout(N),dep(N);
int cur=0;
void dfs(int x,int p){
    tin[x]=cur++;
    for(auto y:adj[x]){
        if(y!=p){
            dep[y]=dep[x]+1;
            dfs(y,x);
        }
    }
    tout[x]=cur++;
}

vector<int>label(int n,int k,vector<int>u,vector<int>v){
    cur=0;
    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,-1);
    vector<int>l(n);
    for(int i=0;i<n;i++){
        if(dep[i]%2==0){
            l[i]=tin[i];
        }
        else{
            l[i]=tout[i];
        }
    }
    return l;
}
 
int find_next_station(int s,int t,vector<int>c){
    if(s<c[0]){
        int l=s+1;
        for(int i=0;i<(int)c.size()-1;i++){
            if(l<=t&&t<=c[i]){
                return c[i];
            }
            l=c[i]+1;
        }
        return c.back();
    }
    else{
        int r=s-1;
        for(int i=(int)c.size()-1;i>0;i--){
            if(c[i]<=t&&t<=r){
                return c[i];
            }
            r=c[i]-1;
        }
        return c[0];
    }
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 50 / 61