{ "data": { "question": { "questionId": "587", "questionFrontendId": "587", "categoryTitle": "Algorithms", "boundTopicId": 1801, "title": "Erect the Fence", "titleSlug": "erect-the-fence", "content": "

You are given an array trees where trees[i] = [xi, yi] represents the location of a tree in the garden.

\n\n

Fence the entire garden using the minimum length of rope, as it is expensive. The garden is well-fenced only if all the trees are enclosed.

\n\n

Return the coordinates of trees that are exactly located on the fence perimeter. You may return the answer in any order.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: trees = [[1,1],[2,2],[2,0],[2,4],[3,3],[4,2]]\nOutput: [[1,1],[2,0],[4,2],[3,3],[2,4]]\nExplanation: All the trees will be on the perimeter of the fence except the tree at [2, 2], which will be inside the fence.\n
\n\n

Example 2:

\n\"\"\n
\nInput: trees = [[1,2],[2,2],[4,2]]\nOutput: [[4,2],[2,2],[1,2]]\nExplanation: The fence forms a line that passes through all the trees.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "安装栅栏", "translatedContent": "

给定一个数组 trees，其中 trees[i] = [xi, yi] 表示树在花园中的位置。

\n\n

你被要求用最短长度的绳子把整个花园围起来，因为绳子很贵。只有把 所有的树都围起来，花园才围得很好。

\n\n

返回恰好位于围栏周边的树木的坐标。

\n\n

示例 1:

\n\n

\n\n
\n输入: points = [[1,1],[2,2],[2,0],[2,4],[3,3],[4,2]]\n输出: [[1,1],[2,0],[3,3],[2,4],[4,2]]
\n\n

示例 2:

\n\n

\n\n
\n输入: points = [[1,2],[2,2],[4,2]]\n输出: [[4,2],[2,2],[1,2]]
\n\n

 

\n\n

注意:

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