Submission #787669

#	Time	Username	Problem	Language	Result	Execution time	Memory
787669		khshg	Rarest Insects (IOI22_insects)	C++17	53.13 / 100	159 ms	472 KiB

insects

#include"insects.h"
#include<bits/stdc++.h>
using namespace std;

int min_cardinality(int N) {
	int k;
	int D = 0;
	set<int> INs;
	for(int i = 0; i < N; ++i) {
		INs.insert(i);
		move_inside(i);
		k = press_button();
		if(k == 2) {
			INs.erase(i);
			move_outside(i);
			continue;
		}
		++D;
	}
	int tl = 1, tr = N / D;
	while(tl < tr) {
		int tm = (tl + tr + 1) / 2;
		for(int i = 0; i < N; ++i) {
			if(!INs.insert(i).second) continue;
			move_inside(i);
			k = press_button();
			if(k > tm) {
				INs.erase(i);
				move_outside(i);
				continue;
			}
			if(D * tm == (int)INs.size()) break;
		}
		if((int)INs.size() < D * tm) {
			tr = tm - 1;
			if(tl == tr) continue;
			for(auto& u : INs) move_outside(u);
			INs.clear();
		} else {
			tl = tm;
		}
	}
	return (tl + tr) / 2;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 28.13 / 75