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            "questionId": "2828",
            "questionFrontendId": "2734",
            "categoryTitle": "Algorithms",
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            "title": "Lexicographically Smallest String After Substring Operation",
            "titleSlug": "lexicographically-smallest-string-after-substring-operation",
            "content": "<p>Given a string <code>s</code> consisting of lowercase English letters. Perform the following operation:</p>\n\n<ul>\n\t<li>Select any non-empty <span data-keyword=\"substring-nonempty\">substring</span> then replace every letter of the substring with the preceding letter of the English alphabet. For example, &#39;b&#39; is converted to &#39;a&#39;, and &#39;a&#39; is converted to &#39;z&#39;.</li>\n</ul>\n\n<p>Return the <span data-keyword=\"lexicographically-smaller-string\"><strong>lexicographically smallest</strong></span> string <strong>after performing the operation</strong>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;cbabc&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;baabc&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Perform the operation on the substring starting at index 0, and ending at index 1 inclusive.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;aa&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;az&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Perform the operation on the last letter.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;acbbc&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;abaab&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Perform the operation on the substring starting at index 1, and ending at index 4 inclusive.</p>\n</div>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;leetcode&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;kddsbncd&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Perform the operation on the entire string.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 3 * 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of lowercase English letters</li>\n</ul>\n",
            "translatedTitle": "执行子串操作后的字典序最小字符串",
            "translatedContent": "<p>给你一个仅由小写英文字母组成的字符串 <code>s</code> 。在一步操作中，你可以完成以下行为：</p>\n\n<ul>\n\t<li>选择&nbsp;<code>s</code> 的任一非空子字符串，可能是整个字符串，接着将字符串中的每一个字符替换为英文字母表中的前一个字符。例如，'b' 用 'a' 替换，'a' 用 'z' 替换。</li>\n</ul>\n\n<p>返回执行上述操作 <strong>恰好一次</strong> 后可以获得的 <strong>字典序最小</strong> 的字符串。</p>\n\n<p><strong>子字符串</strong> 是字符串中的一个连续字符序列。</p>\n现有长度相同的两个字符串 <code>x</code> 和 字符串 <code>y</code> ，在满足&nbsp;<code>x[i] != y[i]</code> 的第一个位置 <code>i</code> 上，如果&nbsp; <code>x[i]</code> 在字母表中先于 <code>y[i]</code> 出现，则认为字符串 <code>x</code> 比字符串 <code>y</code> <strong>字典序更小</strong> 。\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"cbabc\"\n<strong>输出：</strong>\"baabc\"\n<strong>解释：</strong>我们选择从下标 0 开始、到下标 1 结束的子字符串执行操作。 \n可以证明最终得到的字符串是字典序最小的。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"acbbc\"\n<strong>输出：</strong>\"abaab\"\n<strong>解释：</strong>我们选择从下标 1 开始、到下标 4 结束的子字符串执行操作。\n可以证明最终得到的字符串是字典序最小的。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"leetcode\"\n<strong>输出：</strong>\"kddsbncd\"\n<strong>解释：</strong>我们选择整个字符串执行操作。\n可以证明最终得到的字符串是字典序最小的。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 3 * 10<sup>5</sup></code></li>\n\t<li><code>s</code> 仅由小写英文字母组成</li>\n</ul>\n",
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