{ "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.
You are asked to 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\nReturn the coordinates of trees that are exactly located on the fence perimeter.
\n\n\n
Example 1:
\n\n\nInput: points = [[1,1],[2,2],[2,0],[2,4],[3,3],[4,2]]\nOutput: [[1,1],[2,0],[3,3],[2,4],[4,2]]\n\n\n
Example 2:
\n\n\nInput: points = [[1,2],[2,2],[4,2]]\nOutput: [[4,2],[2,2],[1,2]]\n\n\n
\n
Constraints:
\n\n1 <= points.length <= 3000
points[i].length == 2
0 <= xi, yi <= 100
在一个二维的花园中,有一些用 (x, y) 坐标表示的树。由于安装费用十分昂贵,你的任务是先用最短的绳子围起所有的树。只有当所有的树都被绳子包围时,花园才能围好栅栏。你需要找到正好位于栅栏边界上的树的坐标。
\r\n\r\n\r\n\r\n
示例 1:
\r\n\r\n输入: [[1,1],[2,2],[2,0],[2,4],[3,3],[4,2]]\r\n输出: [[1,1],[2,0],[4,2],[3,3],[2,4]]\r\n解释:\r\n\r\n\r\n\r\n
示例 2:
\r\n\r\n输入: [[1,2],[2,2],[4,2]]\r\n输出: [[1,2],[2,2],[4,2]]\r\n解释:\r\n\r\n即使树都在一条直线上,你也需要先用绳子包围它们。\r\n\r\n\r\n
\r\n\r\n
注意:
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out-of-bounds<\\/code>\\u548c
use-after-free<\\/code>\\u9519\\u8bef\\u3002<\\/p>\\r\\n\\r\\n
\\r\\nstruct hash_entry {\\r\\n int id; \\/* we'll use this field as the key *\\/\\r\\n char name[10];\\r\\n UT_hash_handle hh; \\/* makes this structure hashable *\\/\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\\r\\n\\r\\n
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\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n<\\/pre>\\r\\n<\\/p>\"],\"csharp\":[\"C#\",\"
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