leetcode-problemset/leetcode-cn/originData/greatest-english-letter-in-upper-and-lower-case.json

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            "title": "Greatest English Letter in Upper and Lower Case",
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            "content": "<p>Given a string of English letters <code>s</code>, return <em>the <strong>greatest </strong>English letter which occurs as <strong>both</strong> a lowercase and uppercase letter in</em> <code>s</code>. The returned letter should be in <strong>uppercase</strong>. If no such letter exists, return <em>an empty string</em>.</p>\n\n<p>An English letter <code>b</code> is <strong>greater</strong> than another letter <code>a</code> if <code>b</code> appears <strong>after</strong> <code>a</code> in the English alphabet.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;l<strong><u>Ee</u></strong>TcOd<u><strong>E</strong></u>&quot;\n<strong>Output:</strong> &quot;E&quot;\n<strong>Explanation:</strong>\nThe letter &#39;E&#39; is the only letter to appear in both lower and upper case.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;a<strong><u>rR</u></strong>AzFif&quot;\n<strong>Output:</strong> &quot;R&quot;\n<strong>Explanation:</strong>\nThe letter &#39;R&#39; is the greatest letter to appear in both lower and upper case.\nNote that &#39;A&#39; and &#39;F&#39; also appear in both lower and upper case, but &#39;R&#39; is greater than &#39;F&#39; or &#39;A&#39;.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;AbCdEfGhIjK&quot;\n<strong>Output:</strong> &quot;&quot;\n<strong>Explanation:</strong>\nThere is no letter that appears in both lower and upper case.\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;= 1000</code></li>\n\t<li><code>s</code> consists of lowercase and uppercase English letters.</li>\n</ul>\n",
            "translatedTitle": "兼具大小写的最好英文字母",
            "translatedContent": "<p>给你一个由英文字母组成的字符串 <code>s</code> ，请你找出并返回 <code>s</code> 中的 <strong>最好</strong> 英文字母。返回的字母必须为大写形式。如果不存在满足条件的字母，则返回一个空字符串。</p>\n\n<p><strong>最好</strong> 英文字母的大写和小写形式必须 <strong>都</strong> 在 <code>s</code> 中出现。</p>\n\n<p>英文字母 <code>b</code> 比另一个英文字母&nbsp;<code>a</code>&nbsp;<strong>更好</strong> 的前提是：英文字母表中，<code>b</code> 在 <code>a</code> 之 <strong>后</strong> 出现。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"l<em><strong>Ee</strong></em>TcOd<em><strong>E</strong></em>\"\n<strong>输出：</strong>\"E\"\n<strong>解释：</strong>\n字母 'E' 是唯一一个大写和小写形式都出现的字母。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"a<em><strong>rR</strong></em>AzFif\"\n<strong>输出：</strong>\"R\"\n<strong>解释：</strong>\n字母 'R' 是大写和小写形式都出现的最好英文字母。\n注意 'A' 和 'F' 的大写和小写形式也都出现了，但是 'R' 比 'F' 和 'A' 更好。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"AbCdEfGhIjK\"\n<strong>输出：</strong>\"\"\n<strong>解释：</strong>\n不存在大写和小写形式都出现的字母。\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;= 1000</code></li>\n\t<li><code>s</code> 由小写和大写英文字母组成</li>\n</ul>\n",
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