Submission #1223140

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223140		yuqzii	Rarest Insects (IOI22_insects)	C++20	90.24 / 100	24 ms	408 KiB

insects

#include "insects.h"
#include <vector>
#include <numeric>

using namespace std;

int min_cardinality(int N) {
	int k = 0, cnt = 0;
	vector<char> in(N);
	for (int i = 0; i < N; i++) {
		move_inside(i);
		if (press_button() == 1) {
			++k;
			++cnt;
			in[i] = true;
		}
		else 
			move_outside(i);
	}

	int l = 1, r = N / k + 1;
	vector<int> possible(N);
	iota(possible.begin(), possible.end(), 0);
	while (l < r - 1) {
		int x = (l + r) / 2;

		for (int i : possible) {
			if (!in[i]) {
				move_inside(i);
				if (press_button() > x)
					move_outside(i);
				else {
					++cnt;
					in[i] = true;
				}
			}
		}

		if (cnt == k * x) {
			l = x;
		} else {
			r = x;
			possible.clear();
			for (int i = 0; i < N; i++) if (in[i]) {
				move_outside(i);
				in[i] = false;
				possible.push_back(i);
				--cnt;
			}
		}
	}

	return l;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 65.24 / 75