mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
16 KiB
JSON
180 lines
16 KiB
JSON
{
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"questionId": "2427",
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"boundTopicId": null,
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"title": "First Letter to Appear Twice",
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"titleSlug": "first-letter-to-appear-twice",
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"content": "<p>Given a string <code>s</code> consisting of lowercase English letters, return <em>the first letter to appear <strong>twice</strong></em>.</p>\n\n<p><strong>Note</strong>:</p>\n\n<ul>\n\t<li>A letter <code>a</code> appears twice before another letter <code>b</code> if the <strong>second</strong> occurrence of <code>a</code> is before the <strong>second</strong> occurrence of <code>b</code>.</li>\n\t<li><code>s</code> will contain at least one letter that appears twice.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abccbaacz"\n<strong>Output:</strong> "c"\n<strong>Explanation:</strong>\nThe letter 'a' appears on the indexes 0, 5 and 6.\nThe letter 'b' appears on the indexes 1 and 4.\nThe letter 'c' appears on the indexes 2, 3 and 7.\nThe letter 'z' appears on the index 8.\nThe letter 'c' is the first letter to appear twice, because out of all the letters the index of its second occurrence is the smallest.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abcdd"\n<strong>Output:</strong> "d"\n<strong>Explanation:</strong>\nThe only letter that appears twice is 'd' so we return 'd'.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= s.length <= 100</code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n\t<li><code>s</code> has at least one repeated letter.</li>\n</ul>\n",
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"translatedTitle": null,
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"difficulty": "Easy",
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"likes": 943,
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"exampleTestcases": "\"abccbaacz\"\n\"abcdd\"",
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"categoryTitle": "Algorithms",
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"name": "Hash Table",
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"name": "String",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Solution {\npublic:\n char repeatedCharacter(string s) {\n \n }\n};",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Java",
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"langSlug": "java",
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"code": "class Solution {\n public char repeatedCharacter(String s) {\n \n }\n}",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Python",
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"langSlug": "python",
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"code": "class Solution(object):\n def repeatedCharacter(self, s):\n \"\"\"\n :type s: str\n :rtype: str\n \"\"\"\n ",
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"__typename": "CodeSnippetNode"
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},
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"lang": "Python3",
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"langSlug": "python3",
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"code": "class Solution:\n def repeatedCharacter(self, s: str) -> str:\n ",
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"lang": "C",
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Solution {\n public char RepeatedCharacter(string s) {\n \n }\n}",
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"lang": "JavaScript",
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"code": "/**\n * @param {string} s\n * @return {character}\n */\nvar repeatedCharacter = function(s) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param String $s\n * @return String\n */\n function repeatedCharacter($s) {\n \n }\n}",
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"lang": "Swift",
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"code": "class Solution {\n func repeatedCharacter(_ s: String) -> Character {\n \n }\n}",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun repeatedCharacter(s: String): Char {\n \n }\n}",
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class Solution {\n String repeatedCharacter(String s) {\n \n }\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func repeatedCharacter(s string) byte {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String} s\n# @return {Character}\ndef repeated_character(s)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def repeatedCharacter(s: String): Char = {\n \n }\n}",
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn repeated_character(s: String) -> char {\n \n }\n}",
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define/contract (repeated-character s)\n (-> string? char?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec repeated_character(S :: unicode:unicode_binary()) -> char().\nrepeated_character(S) ->\n .",
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},
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{
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec repeated_character(s :: String.t) :: char\n def repeated_character(s) do\n \n end\nend",
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}
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"hints": [
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"Iterate through the string from left to right. Keep track of the elements you have already seen in a set.",
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"If the current element is already in the set, return that element."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "\"abccbaacz\"",
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"metaData": "{\n \"name\": \"repeatedCharacter\",\n \"params\": [\n {\n \"name\": \"s\",\n \"type\": \"string\"\n }\n ],\n \"return\": {\n \"type\": \"character\"\n }\n}",
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Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. 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