답안 #384277

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
384277 2021-04-01T05:28:30 Z Drew_ 쌀 창고 (IOI11_ricehub) C++14
100 / 100
98 ms 3308 KB
#include "ricehub.h"
#include <iostream>
using namespace std;

#define ll long long
#define int ll

const int MAX = 1e5 + 7;

int n;
ll ar[MAX];
ll pfx[MAX];
ll budget;

int solve(int hub) //place a hub in ar[hub], calculate maximum amount of rice
{
	int l1 = 1, r1 = hub;
	while (l1 < r1)
	{
		int mid1 = (l1 + r1) / 2;
		ll cost1 = (hub - mid1) * ar[hub] - (pfx[hub-1] - pfx[mid1 - 1]);
		ll rt_cost = (pfx[n] - pfx[hub-1]) - (n - hub + 1) * ar[hub];

		if (cost1 > budget) l1 = mid1 + 1;
		else if (cost1 + rt_cost <= budget) r1 = mid1;
		else
		{
			int l2 = hub, r2 = n;
			while (l2 < r2)
			{
				int mid2 = (l2 + r2 + 1) / 2;
				ll cost2 = (pfx[mid2] - pfx[hub-1]) - (mid2 - hub + 1) * ar[hub];

				if (cost1 + cost2 <= budget) l2 = mid2;
				else r2 = mid2 - 1;
			}

			if (ar[l2+1] - ar[hub] < ar[hub] - ar[mid1]) l1 = mid1 + 1;
			else r1 = mid1;
		}
	}

	ll cost1 = (hub - l1) * ar[hub] - (pfx[hub-1] - pfx[l1 - 1]);

	int l2 = hub, r2 = n;
	while (l2 < r2)
	{
		int mid2 = (l2 + r2 + 1) / 2;
		ll cost2 = (pfx[mid2] - pfx[hub-1]) - (mid2 - hub + 1) * ar[hub];

		if (cost1 + cost2 <= budget) l2 = mid2;
		else r2 = mid2 - 1;
	}

	return l2 - l1 + 1;
}

int32_t besthub(int32_t R, int32_t L, int32_t X[], long long B)
{
	n = R;
	budget = B;

	for (int i = 1; i <= R; ++i)
	{
		ar[i] = X[i-1];
		pfx[i] = pfx[i-1] + X[i-1];
	}


	int res = 0;
	for (int i = 1; i <= R; ++i)
	{
		//cerr << i << ": " << solve(i) << '\n';
		res = max(res, solve(i));
	}
	return res;
}
# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 2 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 2 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 2 ms 364 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 2 ms 364 KB Output is correct
7 Correct 2 ms 364 KB Output is correct
8 Correct 2 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 2 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 2 ms 364 KB Output is correct
18 Correct 2 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 2 ms 364 KB Output is correct
21 Correct 4 ms 640 KB Output is correct
22 Correct 4 ms 492 KB Output is correct
23 Correct 2 ms 492 KB Output is correct
24 Correct 4 ms 512 KB Output is correct
25 Correct 3 ms 492 KB Output is correct
26 Correct 4 ms 492 KB Output is correct
27 Correct 5 ms 492 KB Output is correct
28 Correct 5 ms 492 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 876 KB Output is correct
2 Correct 12 ms 876 KB Output is correct
3 Correct 26 ms 3308 KB Output is correct
4 Correct 98 ms 3308 KB Output is correct
5 Correct 25 ms 1644 KB Output is correct
6 Correct 29 ms 1772 KB Output is correct
7 Correct 24 ms 3052 KB Output is correct
8 Correct 84 ms 3052 KB Output is correct
9 Correct 54 ms 1644 KB Output is correct
10 Correct 54 ms 1644 KB Output is correct
11 Correct 24 ms 3308 KB Output is correct
12 Correct 95 ms 3308 KB Output is correct
13 Correct 35 ms 1644 KB Output is correct
14 Correct 34 ms 1644 KB Output is correct
15 Correct 19 ms 2540 KB Output is correct
16 Correct 69 ms 2540 KB Output is correct
17 Correct 23 ms 3052 KB Output is correct
18 Correct 83 ms 3052 KB Output is correct
19 Correct 24 ms 3208 KB Output is correct
20 Correct 97 ms 3308 KB Output is correct