Submission #639057

#	Time	Username	Problem	Language	Result	Execution time	Memory
639057		dxz05	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	204 ms	412 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>

using namespace std;

int min_cardinality(int N) {
    int diff = 0;
    vector<bool> in(N, false);
    for (int i = 0; i < N; i++) {
        in[i] = true;
        move_inside(i);
        diff++;
        if (press_button() >= 2) {
            in[i] = false;
            move_outside(i);
            diff--;
        }
    }

    int l = 1, r = N / diff;
    while (l <= r){
        int m = (l + r) >> 1;

        for (int i = 0; i < N; i++) {
            if (!in[i]){
                in[i] = true;
                move_inside(i);
            }
            if (press_button() > m) {
                in[i] = false;
                move_outside(i);
            }
        }

        bool check = (count(in.begin(), in.end(), true) == m * diff);

        if (check){
            l = m + 1;
        } else {
            r = m - 1;
            for (int i = 0; i < N; i++){
                if (in[i]){
                    move_outside(i);
                    in[i] = false;    
                }
            }
        }
    }

    return r;
}

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