Submission #637200

#	Time	Username	Problem	Language	Result	Execution time	Memory
637200		blue	Rarest Insects (IOI22_insects)	C++17	0 / 100	1 ms	208 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)
{
	// cerr << "insert " << i << '\n';
	if(ins[i]) 
		return;

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

void move_out(int i)
{
	// cerr << "erase " << i << '\n';
	if(!ins[i])
		return;

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

int min_cardinality(int N)
{
	int types = 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;
			types++;
		}
	}
	for(int i = 0; i < N; i++)
		move_out(i);


	int lg = 0;
	while((1<<lg) < N/types)
		lg++;

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

	int tst = 0;

	for(int b = lg-1; b >= 0; b--)
	{
		int ntst = tst + (1<<b);

		vi inserted;
		vi not_inserted;
		for(int i : cand)
		{
			if(ntst * types == ct)
			{
				not_inserted.push_back(i);
				continue;
			}

			move_in(i);

			if(press_button() > ntst)
			{
				move_out(i);
				not_inserted.push_back(i);
			}
			else
				inserted.push_back(i);
		}

		if(ct == types * ntst)
		{
			tst = ntst;
			cand = not_inserted;
			inserted.clear();
			not_inserted.clear();
		}
		else
		{
			for(int i : inserted)
				move_out(i);
			cand = inserted;
			inserted.clear();
			not_inserted.clear();
		}
	}
	return tst;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75