Submission #635042

#	Time	Username	Problem	Language	Result	Execution time	Memory
635042		coloboxx	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	290 ms	368 KiB

insects

#include "insects.h"
#include <vector>
using namespace std;
 
int n;
 
int count_insects(int bound) {
	vector<int> insects;
	for (int i = 0; i < n; i++) {
		move_inside(i);
		if (press_button() > bound) move_outside(i);
		else insects.push_back(i);
	}
	for (auto i : insects) move_outside(i);
	return (int)insects.size();
}
 
int min_cardinality(int N) {
	n = N;
	int groups = count_insects(1);
	int l = 2, r = n, ans = 1;
	while (l <= r) {
		int mid = (l + r) / 2;
		if (count_insects(mid) == groups * mid) {
			ans = mid;
			l = mid + 1;
		}
		else r = mid - 1;
	}
	return ans;
}

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