Submission #652837

#	Time	Username	Problem	Language	Result	Execution time	Memory
652837		Lobo	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	252 ms	500 KiB

insects

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

const int maxn = 2020;
int n, in[maxn], qtd[maxn];
int diff = 1;
int cnt = 0;
int cur = 1;
int check(int mid) {
    for(int i = 0; i < n; i++) {
        if(in[i]) continue;
        move_inside(i); in[i] = 1; cnt++;
        int qry = press_button();
        if(qry > cur) {
            qtd[i] = qry;
        }
        cur = qry;
        if(cur > mid) {
            move_outside(i); in[i] = 0; cnt--;
            cur--;
        }
    }


    if(mid*diff == cnt) {
        return true;
    }
    else {
        return false;
    }
}
int min_cardinality(int N) {
    n = N;
    
    // First count the number of different numbers
    move_inside(0); in[0] = 1; cnt++;
    qtd[0] = 1;
    for(int i = 1; i < n; i++) {
        move_inside(i); in[i] = 1; cnt++;
        qtd[i] = 1;
        diff++;
        int qry = press_button();
        if(qry == 2) {
            diff--;
            move_outside(i); in[i] = 0; cnt--;
            qtd[i] = 2;
        }
    }
    if(diff == 1) return n;
    if(diff == n) return 1;
    int l = 1;
    int r = n;
    int ans = -1;
    while(l <= r) {
        int mid = (l+r)/2; // I want to see if the answer is <= mid

        if(check(mid)) {
            ans = mid;
            l = mid+1;
        }
        else {
            r = mid-1;
        }
        
        for(int i = 0; i < n; i++) {
            if(in[i]) {
                move_outside(i); in[i] = 0; cnt--;
            }
        }
        cur = 0;
    }
    return ans;
}

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