{ "data": { "question": { "questionId": "3113", "questionFrontendId": "2866", "categoryTitle": "Algorithms", "boundTopicId": 2453609, "title": "Beautiful Towers II", "titleSlug": "beautiful-towers-ii", "content": "
You are given a 0-indexed array maxHeights
of n
integers.
You are tasked with building n
towers in the coordinate line. The ith
tower is built at coordinate i
and has a height of heights[i]
.
A configuration of towers is beautiful if the following conditions hold:
\n\n1 <= heights[i] <= maxHeights[i]
heights
is a mountain array.Array heights
is a mountain if there exists an index i
such that:
0 < j <= i
, heights[j - 1] <= heights[j]
i <= k < n - 1
, heights[k + 1] <= heights[k]
Return the maximum possible sum of heights of a beautiful configuration of towers.
\n\n\n
Example 1:
\n\n\nInput: maxHeights = [5,3,4,1,1]\nOutput: 13\nExplanation: One beautiful configuration with a maximum sum is heights = [5,3,3,1,1]. This configuration is beautiful since:\n- 1 <= heights[i] <= maxHeights[i] \n- heights is a mountain of peak i = 0.\nIt can be shown that there exists no other beautiful configuration with a sum of heights greater than 13.\n\n
Example 2:
\n\n\nInput: maxHeights = [6,5,3,9,2,7]\nOutput: 22\nExplanation: One beautiful configuration with a maximum sum is heights = [3,3,3,9,2,2]. This configuration is beautiful since:\n- 1 <= heights[i] <= maxHeights[i]\n- heights is a mountain of peak i = 3.\nIt can be shown that there exists no other beautiful configuration with a sum of heights greater than 22.\n\n
Example 3:
\n\n\nInput: maxHeights = [3,2,5,5,2,3]\nOutput: 18\nExplanation: One beautiful configuration with a maximum sum is heights = [2,2,5,5,2,2]. This configuration is beautiful since:\n- 1 <= heights[i] <= maxHeights[i]\n- heights is a mountain of peak i = 2. \nNote that, for this configuration, i = 3 can also be considered a peak.\nIt can be shown that there exists no other beautiful configuration with a sum of heights greater than 18.\n\n\n
\n
Constraints:
\n\n1 <= n == maxHeights.length <= 105
1 <= maxHeights[i] <= 109
给你一个长度为 n
下标从 0 开始的整数数组 maxHeights
。
你的任务是在坐标轴上建 n
座塔。第 i
座塔的下标为 i
,高度为 heights[i]
。
如果以下条件满足,我们称这些塔是 美丽 的:
\n\n1 <= heights[i] <= maxHeights[i]
heights
是一个 山脉 数组。如果存在下标 i
满足以下条件,那么我们称数组 heights
是一个 山脉 数组:
0 < j <= i
,都有 heights[j - 1] <= heights[j]
i <= k < n - 1
,都有 heights[k + 1] <= heights[k]
请你返回满足 美丽塔 要求的方案中,高度和的最大值 。
\n\n\n\n
示例 1:
\n\n\n输入:maxHeights = [5,3,4,1,1]\n输出:13\n解释:和最大的美丽塔方案为 heights = [5,3,3,1,1] ,这是一个美丽塔方案,因为:\n- 1 <= heights[i] <= maxHeights[i] \n- heights 是个山脉数组,峰值在 i = 0 处。\n13 是所有美丽塔方案中的最大高度和。\n\n
示例 2:
\n\n\n输入:maxHeights = [6,5,3,9,2,7]\n输出:22\n解释: 和最大的美丽塔方案为 heights = [3,3,3,9,2,2] ,这是一个美丽塔方案,因为:\n- 1 <= heights[i] <= maxHeights[i]\n- heights 是个山脉数组,峰值在 i = 3 处。\n22 是所有美丽塔方案中的最大高度和。\n\n
示例 3:
\n\n\n输入:maxHeights = [3,2,5,5,2,3]\n输出:18\n解释:和最大的美丽塔方案为 heights = [2,2,5,5,2,2] ,这是一个美丽塔方案,因为:\n- 1 <= heights[i] <= maxHeights[i]\n- heights 是个山脉数组,最大值在 i = 2 处。\n注意,在这个方案中,i = 3 也是一个峰值。\n18 是所有美丽塔方案中的最大高度和。\n\n\n
\n\n
提示:
\n\n1 <= n == maxHeights <= 105
1 <= maxHeights[i] <= 109
i
as the peak.",
"Let left[i]
be the maximum sum of heights for the prefix 0, …, i
when index i
is the peak.",
"Let right[i]
be the maximum sum of heights for suffix i, …, (n - 1)
when i
is the peak",
"Compute values of left[i]
from left to right using DP.\r\nFor each i
from 0
to n - 1
, left[i] = maxHeights * (i - j) + answer[j]
, where j
is the rightmost index to the left of i
such that maxHeights[j] < maxHeights[i]
.",
"For each i
from n - 1
to 0
, right[i] = maxHeights * (j - i) + answer[j]
, where j
is the leftmost index to the right of i
such that maxHeights[j] < maxHeights[i]
."
],
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"sampleTestCase": "[5,3,4,1,1]",
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