leetcode-problemset/leetcode-cn/originData/using-a-robot-to-print-the-lexicographically-smallest-string.json

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            "questionId": "2520",
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            "categoryTitle": "Algorithms",
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            "title": "Using a Robot to Print the Lexicographically Smallest String",
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            "content": "<p>You are given a string <code>s</code> and a robot that currently holds an empty string <code>t</code>. Apply one of the following operations until <code>s</code> and <code>t</code> <strong>are both empty</strong>:</p>\n\n<ul>\n\t<li>Remove the <strong>first</strong> character of a string <code>s</code> and give it to the robot. The robot will append this character to the string <code>t</code>.</li>\n\t<li>Remove the <strong>last</strong> character of a string <code>t</code> and give it to the robot. The robot will write this character on paper.</li>\n</ul>\n\n<p>Return <em>the lexicographically smallest string that can be written on the paper.</em></p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;zza&quot;\n<strong>Output:</strong> &quot;azz&quot;\n<strong>Explanation:</strong> Let p denote the written string.\nInitially p=&quot;&quot;, s=&quot;zza&quot;, t=&quot;&quot;.\nPerform first operation three times p=&quot;&quot;, s=&quot;&quot;, t=&quot;zza&quot;.\nPerform second operation three times p=&quot;azz&quot;, s=&quot;&quot;, t=&quot;&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;bac&quot;\n<strong>Output:</strong> &quot;abc&quot;\n<strong>Explanation:</strong> Let p denote the written string.\nPerform first operation twice p=&quot;&quot;, s=&quot;c&quot;, t=&quot;ba&quot;. \nPerform second operation twice p=&quot;ab&quot;, s=&quot;c&quot;, t=&quot;&quot;. \nPerform first operation p=&quot;ab&quot;, s=&quot;&quot;, t=&quot;c&quot;. \nPerform second operation p=&quot;abc&quot;, s=&quot;&quot;, t=&quot;&quot;.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;bdda&quot;\n<strong>Output:</strong> &quot;addb&quot;\n<strong>Explanation:</strong> Let p denote the written string.\nInitially p=&quot;&quot;, s=&quot;bdda&quot;, t=&quot;&quot;.\nPerform first operation four times p=&quot;&quot;, s=&quot;&quot;, t=&quot;bdda&quot;.\nPerform second operation four times p=&quot;addb&quot;, s=&quot;&quot;, t=&quot;&quot;.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of only English lowercase letters.</li>\n</ul>\n",
            "translatedTitle": "使用机器人打印字典序最小的字符串",
            "translatedContent": "<p>给你一个字符串&nbsp;<code>s</code>&nbsp;和一个机器人，机器人当前有一个空字符串&nbsp;<code>t</code>&nbsp;。执行以下操作之一，直到&nbsp;<code>s</code> 和&nbsp;<code>t</code>&nbsp;<strong>都变成空字符串：</strong></p>\n\n<ul>\n\t<li>删除字符串&nbsp;<code>s</code>&nbsp;的 <strong>第一个</strong>&nbsp;字符，并将该字符给机器人。机器人把这个字符添加到 <code>t</code>&nbsp;的尾部。</li>\n\t<li>删除字符串&nbsp;<code>t</code>&nbsp;的&nbsp;<strong>最后一个</strong>&nbsp;字符，并将该字符给机器人。机器人将该字符写到纸上。</li>\n</ul>\n\n<p>请你返回纸上能写出的字典序最小的字符串。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><b>输入：</b>s = \"zza\"\n<b>输出：</b>\"azz\"\n<b>解释：</b>用 p 表示写出来的字符串。\n一开始，p=\"\" ，s=\"zza\" ，t=\"\" 。\n执行第一个操作三次，得到 p=\"\" ，s=\"\" ，t=\"zza\" 。\n执行第二个操作三次，得到 p=\"azz\" ，s=\"\" ，t=\"\" 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><b>输入：</b>s = \"bac\"\n<b>输出：</b>\"abc\"\n<b>解释：</b>用 p 表示写出来的字符串。\n执行第一个操作两次，得到 p=\"\" ，s=\"c\" ，t=\"ba\" 。\n执行第二个操作两次，得到 p=\"ab\" ，s=\"c\" ，t=\"\" 。\n执行第一个操作，得到 p=\"ab\" ，s=\"\" ，t=\"c\" 。\n执行第二个操作，得到 p=\"abc\" ，s=\"\" ，t=\"\" 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><b>输入：</b>s = \"bdda\"\n<b>输出：</b>\"addb\"\n<b>解释：</b>用 p 表示写出来的字符串。\n一开始，p=\"\" ，s=\"bdda\" ，t=\"\" 。\n执行第一个操作四次，得到 p=\"\" ，s=\"\" ，t=\"bdda\" 。\n执行第二个操作四次，得到 p=\"addb\" ，s=\"\" ，t=\"\" 。\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;= 10<sup>5</sup></code></li>\n\t<li><code>s</code>&nbsp;只包含小写英文字母。</li>\n</ul>\n",
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