Submission #834168

#	Time	Username	Problem	Language	Result	Execution time	Memory
834168		Johann	Packing Biscuits (IOI20_biscuits)	C++14	12 / 100	8 ms	1108 KiB

biscuits

#include "biscuits.h"
#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef vector<ll> vi;
typedef vector<vi> vvi;
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

ll X;

long long count_tastiness(long long _X, std::vector<long long> a)
{
	vi b;
	X = _X;
	for (int i = 0; i < sz(a); ++i)
	{
		if (a[i] >= X && i + 1 >= sz(a))
			a.push_back(0);

		ll tmp = a[i] / X;
		if (tmp & 1)
			b.push_back(1);
		else
			b.push_back(min(2LL, tmp));

		if (i + 1 < sz(a))
			a[i + 1] += (a[i] - b.back() * X) / 2;
	}

	if (b.back() != 0)
		b.push_back(0);
	vvi dp(sz(b), vi(3, 0));
	if (b.back() == 0)
		dp.back()[2] = 1;
	else if (b.back() == 1)
		dp.back()[0] = dp.back()[1] = 1;
	else
		dp.back()[0] = dp.back()[1] = dp.back()[2] = 1;

	for (int i = sz(b) - 2; i >= 0; --i)
	{
		ll total = dp[i + 1][0] + dp[i + 1][1] + dp[i + 1][2];
		if (b[i] == 0)
		{
			dp[i][2] = total;
		}
		else if (b[i] == 1)
		{
			dp[i][0] = dp[i][1] = total;
		}
		else
		{
			dp[i][0] = dp[i][1] = total;
			int j = i + 1;
			while (j < sz(b))
			{
				dp[i][2] += dp[j][2];
				if (b[j] == 1)
					++j;
				else
					break;
			}
		}
	}

	return dp[0][0] + dp[0][1] + dp[0][2];
}

• Subtask 1: 0 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23