Submission #627796

#	Time	Username	Problem	Language	Result	Execution time	Memory
627796		peti1234	Rarest Insects (IOI22_insects)	C++17	100 / 100	62 ms	296 KiB

insects

#include <bits/stdc++.h>

using namespace std;
#include "insects.h"
const int c=2005;
int cnt, si, ord[c];
bool v[c], fix[c];
int add(int a) {
    assert(!v[a]);
    v[a]=true;
    si++;
    move_inside(a);
    return press_button();
}
void sub(int a) {
    assert(v[a]);
    v[a]=false;
    si--;
    move_outside(a);
}
int min_cardinality(int N) {
    for (int i=0; i<N; i++) {
        ord[i]=i;
    }
    random_shuffle(ord, ord+N);
    for (int i=0; i<N; i++) {
        if (add(i)==2) {
            sub(i);
        } else {
            cnt++;
        }
    }
    for (int i=0; i<N; i++) {
        if (v[i]) {
            fix[i]=1;
        }
    }
    int lo=1, hi=N/cnt+1, mid;
    while (hi-lo>1) {
        mid=(hi+lo)/2;
        for (int i=0; i<N; i++) {
            int pos=ord[i];
            if (fix[pos] || si==cnt*mid) continue;
            if (add(pos)>mid) {
                sub(pos);
            }
        }
        if (si==cnt*mid) {
            lo=mid;
            for (int i=0; i<N; i++) {
                if (v[i]) {
                    fix[i]=1;
                }
            }
        } else {
            hi=mid;
            for (int i=0; i<N; i++) {
                if (fix[i]) continue;
                if (!v[i]) fix[i]=1;
                else {
                    sub(i);
                }
            }
        }
    }
    return lo;
}
/*
int main()
{
    
    return 0;
}
*/

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