leetcode-problemset/leetcode-cn/originData/previous-permutation-with-one-swap.json

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            "title": "Previous Permutation With One Swap",
            "titleSlug": "previous-permutation-with-one-swap",
            "content": "<p>Given an array of positive integers <code>arr</code> (not necessarily distinct), return <em>the lexicographically largest permutation that is smaller than</em> <code>arr</code>, that can be <strong>made with exactly one swap</strong> (A <em>swap</em> exchanges the positions of two numbers <code>arr[i]</code> and <code>arr[j]</code>). If it cannot be done, then return the same array.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [3,2,1]\n<strong>Output:</strong> [3,1,2]\n<strong>Explanation:</strong> Swapping 2 and 1.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,1,5]\n<strong>Output:</strong> [1,1,5]\n<strong>Explanation:</strong> This is already the smallest permutation.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,9,4,6,7]\n<strong>Output:</strong> [1,7,4,6,9]\n<strong>Explanation:</strong> Swapping 9 and 7.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= arr.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>1 &lt;= arr[i] &lt;= 10<sup>4</sup></code></li>\n</ul>\n",
            "translatedTitle": "交换一次的先前排列",
            "translatedContent": "<p>给你一个正整数的数组 <code>A</code>（其中的元素不一定完全不同），请你返回可在 <strong>一次交换</strong>（交换两数字 <code>A[i]</code> 和 <code>A[j]</code> 的位置）后得到的、按字典序排列小于 <code>A</code> 的最大可能排列。</p>\n\n<p>如果无法这么操作，就请返回原数组。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [3,2,1]\n<strong>输出：</strong>[3,1,2]\n<strong>解释：</strong>交换 2 和 1\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [1,1,5]\n<strong>输出：</strong>[1,1,5]\n<strong>解释：</strong>已经是最小排列\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [1,9,4,6,7]\n<strong>输出：</strong>[1,7,4,6,9]\n<strong>解释：</strong>交换 9 和 7\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [3,1,1,3]\n<strong>输出：</strong>[1,3,1,3]\n<strong>解释：</strong>交换 1 和 3\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 10<sup>4</sup></code></li>\n\t<li><code>1 <= arr[i] <= 10<sup>4</sup></code></li>\n</ul>\n",
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            "dailyRecordStatus": null,
            "editorType": "CKEDITOR",
            "ugcQuestionId": null,
            "style": "LEETCODE",
            "exampleTestcases": "[3,2,1]\n[1,1,5]\n[1,9,4,6,7]",
            "__typename": "QuestionNode"
        }
    }
}