Submission #630986

#	Time	Username	Problem	Language	Result	Execution time	Memory
630986		blue	Rarest Insects (IOI22_insects)	C++17	47.50 / 100	215 ms	536 KiB

insects

#include "insects.h"
#include <vector>
#include <iostream>
using namespace std;

using vi = vector<int>;
using vvi = vector<vi>;

const int mx = 2'000;

vi ins(mx, 0);
int ct = 0;

void move_in(int i)
{
	if(ins[i]) 
		return;

	ins[i] = 1;
	move_inside(i);
	ct++;
}

void move_out(int i)
{
	if(!ins[i])
		return;

	ins[i] = 0;
	move_outside(i);
	ct--;
}

int min_cardinality(int N)
{
	int tot = 0;

	vi is_basic(N, 0);

	for(int i = 0; i < N; i++)
	{
		move_in(i);
		if(press_button() >= 2)
			move_out(i);
		else
		{
			is_basic[i] = 1;
			tot++;
		}
	}

	for(int i = 0; i < N; i++)
		move_out(i);

	// cerr << "tot = " << tot << '\n';

	vi currlist;
	for(int i = 0; i < N; i++)
		currlist.push_back(i);

	int uplim = 0;
	for(int e = 10; e >= 0; e--)
	{
		int newlim = uplim + (1<<e);

		vi inlist, outlist;

		for(int i : currlist)
		{
			if(ct > newlim * tot)
			{
				outlist.push_back(i);
				continue;
			}

			move_in(i);

			if(press_button() > newlim)
			{
				move_out(i);
				outlist.push_back(i);
			}
			else
				inlist.push_back(i);
		}

		if(ct == newlim * tot)
		{
			currlist = outlist;
			uplim = newlim;
		}
		else
		{
			for(int i : inlist)
				move_out(i);
			currlist = inlist;
		}
	}
	
	return uplim;
}

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