Submission #809030

#	Time	Username	Problem	Language	Result	Execution time	Memory
809030		BT21tata	Rarest Insects (IOI22_insects)	C++17	Compilation error	0 ms	0 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 inside[i]=1;
        else uni++;
    }
    for(int i=0; i<n; i++)
    {
        if(inside[i]) move_outside(i);
        inside[i]=0;
    }
    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;
                else inside[i]=0, move_outside(i);
            }
        }
    }
    return r;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:37:9: error: 'else' without a previous 'if'
   37 |         else uni++;
      |         ^~~~