Submission #628134

#	Time	Username	Problem	Language	Result	Execution time	Memory
628134		Hanksburger	Rarest Insects (IOI22_insects)	C++17	100 / 100	61 ms	308 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
bool a[2005], b[2005];
vector<int> v;
int min_cardinality(int n)
{
    srand(time(0));
    for (int i=0; i<n; i++)
        v.push_back(i);
    random_shuffle(v.begin(), v.end());
    int d=0;
    for (int i:v)
    {
        move_inside(i);
        b[i]=1;
        d++;
        if (press_button()>1)
        {
            move_outside(i);
            b[i]=0;
            d--;
        }
    }
    for (int i:v)
    {
        if (b[i])
        {
            move_outside(i);
            a[i]=1;
        }
    }
    int l=0, r=(n-d)/d, ans=1;
    while (l<r)
    {
        random_shuffle(v.begin(), v.end());
        int k=(l+r+1)/2, cnt=0;
        for (int i:v)
        {
            if (a[i])
                continue;
            move_inside(i);
            b[i]=1;
            cnt++;
            if (press_button()>k)
            {
                move_outside(i);
                b[i]=0;
                cnt--;
            }
            if (cnt==k*d)
                break;
        }
        if (cnt==k*d)
        {
            for (int i:v)
            {
                if (a[i])
                    continue;
                if (b[i])
                {
                    move_outside(i);
                    a[i]=1;
                }
            }
            ans+=k;
            r-=k;
        }
        else
        {
            for (int i:v)
            {
                if (a[i])
                    continue;
                if (b[i])
                {
                    move_outside(i);
                    b[i]=0;
                }
                else
                    a[i]=1;
            }
            r=k-1;
        }
    }
    return ans+l;
}

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