Submission #1019307

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019307		Boas	Counting Mushrooms (IOI20_mushrooms)	C++17	0 / 100	1 ms	344 KiB

mushrooms

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

#define loop(x, i) for (int i = 0; i < x; i++)
#define pb push_back
#define ALL(x) (x).begin(), (x).end()
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef set<int> si;
typedef vector<vi> vvi;

#define getX (max((int)A.size(), (int)B.size()))

int count_mushrooms(int n)
{
	vi A = {0}, B;
	int c1 = use_machine({0, 1});
	int i = 2;
	if (c1 == 1)
	{
		if (n == 2)
			return 1;
		B.pb(1);
		int c2 = use_machine({1, 2});
		i++;
		if (c2 == 1)
			A.pb(2);
		else
			B.pb(2);
	}
	else
	{
		A.pb(1);
	}
	while (getX < sqrt((double)n))
	{
		if (A.size() >= 2)
		{
			if (i + 1 >= n)
				break;
			int res = use_machine({A[0], i, A[1], i + 1});
			if (res == 0)
			{
				A.pb(i);
				A.pb(i + 1);
			}
			else if (res == 1)
			{
				A.pb(i);
				B.pb(i + 1);
			}
			else if (res == 2)
			{
				A.pb(i + 1);
				B.pb(i);
			}
			else
			{
				B.pb(i);
				B.pb(i + 1);
			}
			i += 2;
		}
		else
		{
			if (i + 1 >= n)
				break;
			int res = use_machine({B[0], i, B[1], i + 1});
			if (res == 3)
			{
				A.pb(i);
				A.pb(i + 1);
			}
			else if (res == 2)
			{
				A.pb(i);
				B.pb(i + 1);
			}
			else if (res == 1)
			{
				A.pb(i + 1);
				B.pb(i);
			}
			else
			{
				B.pb(i + 1);
				B.pb(i);
			}
			i += 2;
		}
	}
	if (i == n - 1)
	{
		if (use_machine({0, i}) == 0)
			A.pb(i);
		i++;
	}
	int res = A.size();
	for (; i < n;)
	{
		int x = getX;
		vi q;
		if (A.size() >= B.size())
		{
			int l = min(2 * getX - 2, n - i);
			if (l % 2 == 1)
				l--;
			for (int j = 0; j + 1 < l; j += 2)
			{
				q.pb(A.at(j / 2));
				q.pb(i + j);
				q.pb(i + j + 1);
			}
			q.pb(A.at(l / 2));
			int c3 = use_machine(q);
			res += l - c3;
			q.clear();
		}
		else
		{
			int l = min(2 * getX - 2, n - i);
			if (l % 2 == 1)
				l--;
			for (int j = 0; j + 1 < l; j += 2)
			{
				q.pb(B.at(j / 2));
				q.pb(i + j);
				q.pb(i + j + 1);
			}
			q.pb(B.at(l / 2));
			int c3 = use_machine(q);
			res += c3;
			q.clear();
		}
		i += x;
	}
	return res;
}

• Subtask 1: 0 / 100