Submission #823132

#	Time	Username	Problem	Language	Result	Execution time	Memory
823132		finn__	Rarest Insects (IOI22_insects)	C++17	100 / 100	48 ms	456 KiB

insects

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

std::bitset<2000> in_machine, deleted;

int min_cardinality(int N)
{
    std::vector<int> j(N);
    std::iota(j.begin(), j.end(), 0);
    std::random_shuffle(j.begin(), j.end());

    int d = 0;
    for (int const &i : j)
    {
        move_inside(i);
        if (press_button() > 1)
            move_outside(i);
        else
            ++d, in_machine[i] = 1;
    }

    int a = 1, b = N / d;
    while (a < b)
    {
        int const mid = (a + b + 1) >> 1;
        std::vector<int> moved;

        int inside = in_machine.count();
        for (int const &i : j)
        {
            if (!deleted[i] && !in_machine[i])
            {
                move_inside(i);
                if (press_button() > mid)
                    move_outside(i);
                else
                    in_machine[i] = 1, moved.push_back(i), ++inside;
            }
            if (inside == d * mid)
                break;
        }

        if (inside == d * mid)
        {
            a = mid;
        }
        else
        {
            b = mid - 1;
            deleted |= ~in_machine;
            for (auto const &i : moved)
                in_machine[i] = 0, move_outside(i);
        }
    }

    return a;
}

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