You are given an integer array nums of size n and a positive integer k.
Divide the array into one or more arrays of size 3 satisfying the following conditions:
nums should be in exactly one array.k.Return a 2D array containing all the arrays. If it is impossible to satisfy the conditions, return an empty array. And if there are multiple answers, return any of them.
\n\n\n
Example 1:
\n\n\nInput: nums = [1,3,4,8,7,9,3,5,1], k = 2\nOutput: [[1,1,3],[3,4,5],[7,8,9]]\nExplanation: We can divide the array into the following arrays: [1,1,3], [3,4,5] and [7,8,9].\nThe difference between any two elements in each array is less than or equal to 2.\nNote that the order of elements is not important.\n\n\n
Example 2:
\n\n\nInput: nums = [1,3,3,2,7,3], k = 3\nOutput: []\nExplanation: It is not possible to divide the array satisfying all the conditions.\n\n\n
\n
Constraints:
\n\nn == nums.length1 <= n <= 105n is a multiple of 3.1 <= nums[i] <= 1051 <= k <= 105给你一个长度为 n 的整数数组 nums，以及一个正整数 k 。
将这个数组划分为一个或多个长度为 3 的子数组，并满足以下条件：
nums 中的 每个 元素都必须 恰好 存在于某个子数组中。k 。返回一个 二维数组 ，包含所有的子数组。如果不可能满足条件，就返回一个空数组。如果有多个答案，返回 任意一个 即可。
\n\n\n\n
示例 1：
\n\n\n输入：nums = [1,3,4,8,7,9,3,5,1], k = 2\n输出：[[1,1,3],[3,4,5],[7,8,9]]\n解释：可以将数组划分为以下子数组：[1,1,3]，[3,4,5] 和 [7,8,9] 。\n每个子数组中任意两个元素的差都小于或等于 2 。\n注意，元素的顺序并不重要。\n\n\n
示例 2：
\n\n\n输入：nums = [1,3,3,2,7,3], k = 3\n输出：[]\n解释：无法划分数组满足所有条件。\n\n\n
\n\n
提示：
\n\nn == nums.length1 <= n <= 105n 是 3 的倍数1 <= nums[i] <= 1051 <= k <= 1053 consecutive elements."
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