![\"\"](\"https://assets.leetcode.com/uploads/2020/10/12/ex1.png\")
Bob is standing at cell (0, 0), and he wants to reach destination: (row, column). He can only travel right and down. You are going to help Bob by providing instructions for him to reach destination.
The instructions are represented as a string, where each character is either:
\n\n'H', meaning move horizontally (go right), or'V', meaning move vertically (go down).Multiple instructions will lead Bob to destination. For example, if destination is (2, 3), both "HHHVV" and "HVHVH" are valid instructions.
However, Bob is very picky. Bob has a lucky number k, and he wants the kth lexicographically smallest instructions that will lead him to destination. k is 1-indexed.
Given an integer array destination and an integer k, return the kth lexicographically smallest instructions that will take Bob to destination.
\n
Example 1:
\n\n
\nInput: destination = [2,3], k = 1\nOutput: "HHHVV"\nExplanation: All the instructions that reach (2, 3) in lexicographic order are as follows:\n["HHHVV", "HHVHV", "HHVVH", "HVHHV", "HVHVH", "HVVHH", "VHHHV", "VHHVH", "VHVHH", "VVHHH"].\n\n\n
Example 2:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2020/10/12/ex2.png\")
\nInput: destination = [2,3], k = 2\nOutput: "HHVHV"\n\n\n
Example 3:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2020/10/12/ex3.png\")
\nInput: destination = [2,3], k = 3\nOutput: "HHVVH"\n\n\n
\n
Constraints:
\n\ndestination.length == 21 <= row, column <= 151 <= k <= nCr(row + column, row), where nCr(a, b) denotes a choose b.Bob 站在单元格 (0, 0) ，想要前往目的地 destination ：(row, column) 。他只能向 右 或向 下 走。你可以为 Bob 提供导航 指令 来帮助他到达目的地 destination 。
指令 用字符串表示，其中每个字符：
\n\n'H' ，意味着水平向右移动'V' ，意味着竖直向下移动能够为 Bob 导航到目的地 destination 的指令可以有多种，例如，如果目的地 destination 是 (2, 3)，\"HHHVV\" 和 \"HVHVH\" 都是有效 指令 。
然而，Bob 很挑剔。因为他的幸运数字是 k，他想要遵循 按字典序排列后的第 k 条最小指令 的导航前往目的地 destination 。k 的编号 从 1 开始 。
给你一个整数数组 destination 和一个整数 k ，请你返回可以为 Bob 提供前往目的地 destination 导航的 按字典序排列后的第 k 条最小指令 。
\n\n
示例 1：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/01/ex1.png\")
\n输入：destination = [2,3], k = 1\n输出：\"HHHVV\"\n解释：能前往 (2, 3) 的所有导航指令 按字典序排列后 如下所示：\n[\"HHHVV\", \"HHVHV\", \"HHVVH\", \"HVHHV\", \"HVHVH\", \"HVVHH\", \"VHHHV\", \"VHHVH\", \"VHVHH\", \"VVHHH\"].\n\n\n
示例 2：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/01/ex2.png\")
\n输入：destination = [2,3], k = 2\n输出：\"HHVHV\"\n\n\n
示例 3：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/01/ex3.png\")
\n输入：destination = [2,3], k = 3\n输出：\"HHVVH\"\n\n\n
\n\n
提示：
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