제출 #392217

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
392217		johutha	비스킷 담기 (IOI20_biscuits)	C++17	12 / 100	6 ms	332 KiB

biscuits

#include "biscuits.h"
#include <iostream>

#define int long long

using namespace std;

int count_tastiness(int x, vector<int> a)
{
	vector<int> dpref(63);
	vector<int> vpref(63);
	vector<int> dp(62);
	a.resize(64);

	int v = 0;
	int pw = 1;

	int m = 62;

	for (int i = 0; i < m; i++, pw *= 2)
	{
		v += a[i]*pw;
		vpref[i] = v;

		int b = v - pw*x;
		int np = pw / 2;
		// cerr << "Starting " << i << ": " << v << " " << b << "\n";

		for (int j = i - 1; j >= 0; j--, np /= 2)
		{
			b = min(b, vpref[j]);
			if (b >= np*x && vpref[j] >= np * x)
			{
				// cerr << "    -> Take " << j << " (add " << 1 + dpref[j] << ") " << "\n";
				b -= np*x;
				dp[i] += 1 + dpref[j];
			}
		}
		if (b >= 0) dp[i]++;

		dpref[i + 1] = dpref[i] + dp[i];
		// cerr << i << " " << dp[i] << " " << dpref[i] << "\n";
	}

	return dpref[m] + 1;
}

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