Submission #1222989

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222989		jakobrs	Rarest Insects (IOI22_insects)	C++20	47.50 / 100	60 ms	428 KiB

insects

#include <numeric>
#include <iostream>
#include <vector>

void move_inside(int i);
void move_outside(int i);
int press_button();

int min_cardinality(int N) {
    std::vector<int> included{};

    auto x = [&](int m) -> int {
        for (int i = 0; i < N; i++) {
            move_inside(i);
            if (press_button() > m)
                move_outside(i);
            else
                included.push_back(i);
        }
        auto res = included.size();
        for (auto x : included)
            move_outside(x);
        included.clear();
        return res;
    };

    auto k = x(1);

    int l = 1;
    int r = N/k + 1;

    while (r - l > 1) {
        auto m = (l + r) / 2;

        auto res = x(m);

        if (res == k * m) {
            l = m;
        } else {
            r = m;
        }
    }

    return l;
}

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