Given an array of positive integers arr (not necessarily distinct), return the lexicographically largest permutation that is smaller than arr, that can be made with exactly one swap. If it cannot be done, then return the same array.
Note that a swap exchanges the positions of two numbers arr[i] and arr[j]
\n
Example 1:
\n\n\nInput: arr = [3,2,1]\nOutput: [3,1,2]\nExplanation: Swapping 2 and 1.\n\n\n
Example 2:
\n\n\nInput: arr = [1,1,5]\nOutput: [1,1,5]\nExplanation: This is already the smallest permutation.\n\n\n
Example 3:
\n\n\nInput: arr = [1,9,4,6,7]\nOutput: [1,7,4,6,9]\nExplanation: Swapping 9 and 7.\n\n\n
\n
Constraints:
\n\n1 <= arr.length <= 1041 <= arr[i] <= 104给你一个正整数数组 arr（可能存在重复的元素），请你返回可在 一次交换（交换两数字 arr[i] 和 arr[j] 的位置）后得到的、按字典序排列小于 arr 的最大排列。
如果无法这么操作，就请返回原数组。
\n\n\n\n
示例 1：
\n\n\n输入：arr = [3,2,1]\n输出：[3,1,2]\n解释：交换 2 和 1\n\n\n
示例 2：
\n\n\n输入：arr = [1,1,5]\n输出：[1,1,5]\n解释：已经是最小排列\n\n\n
示例 3：
\n\n\n输入：arr = [1,9,4,6,7]\n输出：[1,7,4,6,9]\n解释：交换 9 和 7\n\n\n
\n\n
提示：
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