Submission #728519

#	Time	Username	Problem	Language	Result	Execution time	Memory
728519		grogu	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	253 ms	628 KiB

insects

#include "insects.h"
#define dbg(x) cerr<<#x<<": "<<x<<endl
#include <bits/stdc++.h>
#define ll int
#define pll pair<ll,ll>

using namespace std;
#define maxn 2005
ll n;
set<ll> s;
ll uniq = 0;
ll F[maxn];
bool ok[maxn];
ll val[maxn];
ll cur = 0;
void add(ll i){
    if(s.find(i)!=s.end()) return;
    move_inside(i);
    s.insert(i);
}
void del(ll i){
    if(s.find(i)==s.end()){
        cerr<<"out"<<endl;
        return;
    }
    move_outside(i);
    s.erase(i);
}
ll get(){return press_button();}
void klir(){
    while(s.size()) del(*s.begin());
}
ll f(ll x){
    if(F[x]!=-1) return F[x];
    if(cur>x) klir(),cur = 0;
    for(ll i = 0;i<n;i++){
        add(i);
        cur = get();
        if(cur>x) del(i);
        else val[i] = cur;
    }
    return F[x] = s.size();
}
ll min_cardinality(ll N) {
    for(ll i = 0;i<maxn;i++) F[i] = -1;
    n = N;
    for(ll i = 0;i<n;i++) ok[i] = 1;
    uniq = f(1);
    //dbg(uniq);
    ll l = 1, r = n,mid,rez = n;
    while(l<=r){
        mid = (l+r)/2;
        for(ll i = 0;i<n;i++) val[i] = -1;
        if(f(mid)==uniq*mid) l = mid+1,rez = mid;
        else{
            for(ll i = 0;i<n;i++){
                if(s.find(i)!=s.end()&&val[i]>=mid) ok[i] = 0;
            }
            r = mid-1;
        }
    }
    return rez;
}
/**
6
5 8 9 5 9 9
**/

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 22.5 / 75