Submission #809022

#	Time	Username	Problem	Language	Result	Execution time	Memory
809022		BT21tata	Rarest Insects (IOI22_insects)	C++17	0 / 100	68 ms	296 KiB

insects

#include "insects.h"
#include<bits/stdc++.h>
using namespace std;

int uni, n;
bool inside[2005], never[2005];

bool check(int x)
{
    //if(x==1) return 1;
    for(int i=0; i<n; i++)
    {
        if(!inside[i] and !never[i])
        {
            move_inside(i);
            int cur=press_button();
            if(cur>x) move_outside(i);
            else inside[i]=1;
        }
    }
    int cnt=0;
    for(int i=0; i<n; i++)
        cnt+=(inside[i]==1);
    if(x*uni==cnt) return 1;
    return 0;
}

int min_cardinality(int N)
{
    n=N;
    for(int i=0; i<n; i++)
    {
        move_inside(i);
        int x=press_button();
        if(x==2) move_outside(i);
        else uni++;
    }
    for(int i=0; i<n; i++)
        move_outside(i);
    int l=1, r=n/uni;
    while(l<=r)
    {
        int mid=(l+r)>>1;
        if(check(mid)) l=mid+1;
        else
        {
            r=mid-1;
            for(int i=0; i<n; i++)
            {
                if(!inside[i]) never[i]=1;
                inside[i]=0;
            }
        }
    }
    return r;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75