Submission #805045

#	Time	Username	Problem	Language	Result	Execution time	Memory
805045		LittleCube	Counting Mushrooms (IOI20_mushrooms)	C++17	56.93 / 100	8 ms	424 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;

const int k = 100;

int count_mushrooms(int n)
{
	vector<int> a, b;
	int A = 0, B = 0;
	a.emplace_back(0);
	for (int i = 1; i < min(n, 2 * k); i++)
		if (use_machine({0, i}))
			b.push_back(i);
		else
			a.push_back(i);
	if(n <= 2 * k)
		return a.size();
	if (a.size() >= k)
	{
		for (int i = 2 * k; i < n; i += k)
		{
			vector<int> q;
			for (int j = 0; j < k && i + j < n; j++)
			{
				q.emplace_back(a[j]);
				q.emplace_back(i + j);
			}
			B += (use_machine(q) + 1) / 2;
		}
		return n - (int)b.size() - B;
	}
	else 
	{
		for (int i = 2 * k; i < n; i += k)
		{
			vector<int> q;
			for (int j = 0; j < k && i + j < n; j++)
			{
				q.emplace_back(b[j]);
				q.emplace_back(i + j);
			}
			A += (use_machine(q) + 1) / 2;
		}
		return a.size() + A;
	}
}

• Subtask 1: 56.927 / 100