Submission #1140268

#	Time	Username	Problem	Language	Result	Execution time	Memory
1140268		Almonther	Stations (IOI20_stations)	C++20	0 / 100	308 ms	664 KiB

stations

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

#define ll long long
#define co cout<<
using namespace std;
//stuff
const ll maxn=1005;
ll en[maxn],ou[maxn],a[maxn]={};
vector<ll>v1[maxn];
map<ll,ll>mp;
ll tim=1;
void dfs(ll x,ll last,ll dep){
    en[x]=tim++;
    for(auto i:v1[x]){
        if(i!=last) dfs(i,x,dep+1);
    }
    ou[x]=tim++;
    if(dep%2) mp[ou[x]],a[x]=ou[x];
    else mp[en[x]],a[x]=en[x];
}
vector<int>label(int n, int k, vector<int> u, vector<int> v){
    for(int i=0;i<u.size();i++){
        v1[u[i]].push_back(v[i]);
        v1[v[i]].push_back(u[i]);
    }
    dfs(0,0,0);
    ll cnt=0;
    for(auto &i:mp) i.second=cnt,cnt++;
    vector<int>labels;
    for(int i=0;i<n;i++) labels.push_back(i);
    mp={};
    for(int i=0;i<n;i++) ou[i]=en[i]=a[i]=0,v1[i].clear();
    tim=1;
    return labels;
}
int find_next_station(int s, int t, vector<int> c) {
    set<ll>s1;
    for(auto i:c) s1.insert(i);
    ll parent;
    ll l,r;
    if(s==0){
        vector<int>v;
        for(auto i:s1) v.push_back(i);
        for(int i=v.size()-1;i>0;i--){
            if(v[i]>=t&&t>=v[i-1]) return v[i];
        }
        return v.back();
    }
    else if(s<*s1.begin()){
        auto it=s1.end();
        it--;
        parent=*it;
        s1.erase(it);
        it=s1.end();
        it--;
        l=s;
        r=*it;
        // co "wow\n"; 
        if(!(l<=t&&t<=r)) return parent;
        // even i'm the ending time
        // they have the starting
        vector<int>v;
        for(auto i:s1) v.push_back(i);
        for(int i=0;i<v.size()-1;i++){
            if(v[i]<=t&&t<=v[i+1]) return v[i];
        }
        return v.back();
    }
    // else{
    //     parent=*s1.begin();
    //     s1.erase(s1.begin());
    //     l=*s1.begin();
    //     r=s;
    //     if(!(l<=t&&t<=r)) return parent;
    //     // odd they have the finishing i have the starting
    //     vector<int>v;
    //     for(auto i:s1) v.push_back(i);
    //     for(int i=v.size()-1;i>0;i--){
    //         if(v[i]>=t&&t>=v[i-1]) return v[i];
    //     }
    //     return v[0];
    // }
    return c[0];
}

// int main(){
//     co find_next_station(3,0,{7,4,5});
// }

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