| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1139944 | Almonther | Stations (IOI20_stations) | C++20 | 0 ms | 0 KiB |
// #include "stations.h"
#include <bits/stdc++.h>
#define ll int
#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;
ll 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]);
dfs(1,0,1);
ll cnt=0;
for(auto &i:mp) i.second=cnt++;
vector<int>labels;
for(int i=1;i<=n;i++) labels.push_back(mp[a[i]]);
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<*s1.begin()){
auto it=s1.end();
it--;
parent=*it;
s1.erase(it);
it=s1.end();
it--;
l=s;
r=*it;
if(!(l<=t&&t<=r)) return parent;
// even i'm the ending time
// they have the starting
vector<ll>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<ll>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];
}
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int _=1;
// cin>>_;
// while(_--) solve();
return 0;
}