Submission #1204219

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204219		borisAngelov	Counting Mushrooms (IOI20_mushrooms)	C++20	0 / 100	0 ms	420 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>

using namespace std;

int count_mushrooms(int n)
{
	int ans = 0, type = 0;
	int BLOCK_SIZE = sqrt(n);

	for (int i = 0; i < n; ++i)
	{
		vector<int> curr;
		int bound = min(n, i + BLOCK_SIZE - 1);

		for (int j = i; j <= bound; ++j)
		{
			curr.push_back(j);
		}

		if (use_machine(curr) == 0)
		{
			if (type == 0) ans += BLOCK_SIZE;
			i = bound;
			continue;
		}

		int l = i + 1;
		int r = bound;

		while (l <= r)
		{
			int mid = (l + r) / 2;
			vector<int> query;

			for (int j = i; j <= mid; ++j)
			{
				query.push_back(j);
			}

			int result = use_machine(query);

			if (result == 0)
			{
				l = mid + 1;
			}
			else
			{
				r = mid - 1;
			}
		}

		if (type == 0) ans += (r - i + 1);
		i = r;
		type = 1 - type;
	}

	return ans;
}

• Subtask 1: 0 / 100