mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
15 KiB
JSON
174 lines
15 KiB
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> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "l<strong><u>Ee</u></strong>TcOd<u><strong>E</strong></u>"\n<strong>Output:</strong> "E"\n<strong>Explanation:</strong>\nThe letter 'E' is the only letter to appear in both lower and upper case.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "a<strong><u>rR</u></strong>AzFif"\n<strong>Output:</strong> "R"\n<strong>Explanation:</strong>\nThe letter 'R' is the greatest letter to appear in both lower and upper case.\nNote that 'A' and 'F' also appear in both lower and upper case, but 'R' is greater than 'F' or 'A'.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "AbCdEfGhIjK"\n<strong>Output:</strong> ""\n<strong>Explanation:</strong>\nThere is no letter that appears in both lower and upper case.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 1000</code></li>\n\t<li><code>s</code> consists of lowercase and uppercase English letters.</li>\n</ul>\n",
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"code": "-spec greatest_letter(S :: unicode:unicode_binary()) -> unicode:unicode_binary().\ngreatest_letter(S) ->\n .",
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"Consider iterating through the string and storing each unique character that occurs in a set.",
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"From Z to A, check whether both the uppercase and lowercase version occur in the set."
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