leetcode-problemset/leetcode-cn/originData/apply-operations-to-make-string-empty.json

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        "question": {
            "questionId": "3308",
            "questionFrontendId": "3039",
            "categoryTitle": "Algorithms",
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            "title": "Apply Operations to Make String Empty",
            "titleSlug": "apply-operations-to-make-string-empty",
            "content": "<p>You are given a string <code>s</code>.</p>\n\n<p>Consider performing the following operation until <code>s</code> becomes <strong>empty</strong>:</p>\n\n<ul>\n\t<li>For <strong>every</strong> alphabet character from <code>&#39;a&#39;</code> to <code>&#39;z&#39;</code>, remove the <strong>first</strong> occurrence of that character in <code>s</code> (if it exists).</li>\n</ul>\n\n<p>For example, let initially <code>s = &quot;aabcbbca&quot;</code>. We do the following operations:</p>\n\n<ul>\n\t<li>Remove the underlined characters <code>s = &quot;<u><strong>a</strong></u>a<strong><u>bc</u></strong>bbca&quot;</code>. The resulting string is <code>s = &quot;abbca&quot;</code>.</li>\n\t<li>Remove the underlined characters <code>s = &quot;<u><strong>ab</strong></u>b<u><strong>c</strong></u>a&quot;</code>. The resulting string is <code>s = &quot;ba&quot;</code>.</li>\n\t<li>Remove the underlined characters <code>s = &quot;<u><strong>ba</strong></u>&quot;</code>. The resulting string is <code>s = &quot;&quot;</code>.</li>\n</ul>\n\n<p>Return <em>the value of the string </em><code>s</code><em> right <strong>before</strong> applying the <strong>last</strong> operation</em>. In the example above, answer is <code>&quot;ba&quot;</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aabcbbca&quot;\n<strong>Output:</strong> &quot;ba&quot;\n<strong>Explanation:</strong> Explained in the statement.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abcd&quot;\n<strong>Output:</strong> &quot;abcd&quot;\n<strong>Explanation:</strong> We do the following operation:\n- Remove the underlined characters s = &quot;<u><strong>abcd</strong></u>&quot;. The resulting string is s = &quot;&quot;.\nThe string just before the last operation is &quot;abcd&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;= 5 * 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists only of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "进行操作使字符串为空",
            "translatedContent": "<p>给你一个字符串&nbsp;<code>s</code>&nbsp;。</p>\n\n<p>请你进行以下操作直到 <code>s</code>&nbsp;为 <strong>空</strong>&nbsp;：</p>\n\n<ul>\n\t<li>每次操作 <strong>依次</strong> 遍历 <code>'a'</code> 到 <code>'z'</code>，如果当前字符出现在 <code>s</code> 中，那么删除出现位置&nbsp;<strong>最早</strong>&nbsp;的该字符。</li>\n</ul>\n\n<p>请你返回进行 <strong>最后</strong>&nbsp;一次操作 <strong>之前</strong>&nbsp;的字符串<em>&nbsp;</em><code>s</code><em>&nbsp;</em>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>s = \"aabcbbca\"\n<b>输出：</b>\"ba\"\n<b>解释：</b>我们进行以下操作：\n- 删除 s = \"<em><strong>a</strong></em>a<em><strong>bc</strong></em>bbca\" 中加粗加斜字符，得到字符串 s = \"abbca\" 。\n- 删除 s = \"<em><strong>ab</strong></em>b<em><strong>c</strong></em>a\" 中加粗加斜字符，得到字符串 s = \"ba\" 。\n- 删除 s = \"<em><strong>ba</strong></em>\" 中加粗加斜字符，得到字符串 s = \"\" 。\n进行最后一次操作之前的字符串为 \"ba\" 。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>s = \"abcd\"\n<b>输出：</b>\"abcd\"\n<b>解释：</b>我们进行以下操作：\n- 删除 s = \"<em><strong>abcd</strong></em>\" 中加粗加斜字符，得到字符串 s = \"\" 。\n进行最后一次操作之前的字符串为 \"abcd\" 。\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;= 5 * 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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                "Before the last operation, only the most frequent characters in the original string will remain.",
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