mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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155 lines
16 KiB
JSON
155 lines
16 KiB
JSON
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"questionId": "443",
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"title": "String Compression",
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"content": "<p>Given an array of characters <code>chars</code>, compress it using the following algorithm:</p>\n\n<p>Begin with an empty string <code>s</code>. For each group of <strong>consecutive repeating characters</strong> in <code>chars</code>:</p>\n\n<ul>\n\t<li>If the group's length is <code>1</code>, append the character to <code>s</code>.</li>\n\t<li>Otherwise, append the character followed by the group's length.</li>\n</ul>\n\n<p>The compressed string <code>s</code> <strong>should not be returned separately</strong>, but instead, be stored <strong>in the input character array <code>chars</code></strong>. Note that group lengths that are <code>10</code> or longer will be split into multiple characters in <code>chars</code>.</p>\n\n<p>After you are done <strong>modifying the input array,</strong> return <em>the new length of the array</em>.</p>\n\n<p>You must write an algorithm that uses only constant extra space.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a","a","b","b","c","c","c"]\n<strong>Output:</strong> Return 6, and the first 6 characters of the input array should be: ["a","2","b","2","c","3"]\n<strong>Explanation:</strong> The groups are "aa", "bb", and "ccc". This compresses to "a2b2c3".\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a"]\n<strong>Output:</strong> Return 1, and the first character of the input array should be: ["a"]\n<strong>Explanation:</strong> The only group is "a", which remains uncompressed since it's a single character.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> chars = ["a","b","b","b","b","b","b","b","b","b","b","b","b"]\n<strong>Output:</strong> Return 4, and the first 4 characters of the input array should be: ["a","b","1","2"].\n<strong>Explanation:</strong> The groups are "a" and "bbbbbbbbbbbb". This compresses to "ab12".</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= chars.length <= 2000</code></li>\n\t<li><code>chars[i]</code> is a lowercase English letter, uppercase English letter, digit, or symbol.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "[\"a\",\"a\",\"b\",\"b\",\"c\",\"c\",\"c\"]\n[\"a\"]\n[\"a\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\",\"b\"]",
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"categoryTitle": "Algorithms",
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"name": "Two Pointers",
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"lang": "C++",
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"code": "class Solution {\npublic:\n int compress(vector<char>& chars) {\n \n }\n};",
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"code": "class Solution {\n public int compress(char[] chars) {\n \n }\n}",
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"lang": "Python",
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"code": "class Solution(object):\n def compress(self, chars):\n \"\"\"\n :type chars: List[str]\n :rtype: int\n \"\"\"\n ",
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"code": "/**\n * @param {character[]} chars\n * @return {number}\n */\nvar compress = function(chars) {\n \n};",
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"lang": "Ruby",
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"code": "# @param {Character[]} chars\n# @return {Integer}\ndef compress(chars)\n \nend",
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"code": "class Solution {\n func compress(_ chars: inout [Character]) -> Int {\n \n }\n}",
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"lang": "Go",
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"code": "func compress(chars []byte) int {\n \n}",
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"lang": "Scala",
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"code": "object Solution {\n def compress(chars: Array[Char]): Int = {\n \n }\n}",
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"code": "class Solution {\n fun compress(chars: CharArray): Int {\n \n }\n}",
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"code": "impl Solution {\n pub fn compress(chars: &mut Vec<char>) -> i32 {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param String[] $chars\n * @return Integer\n */\n function compress(&$chars) {\n \n }\n}",
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "function compress(chars: string[]): number {\n\n};",
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"code": "(define/contract (compress chars)\n (-> (listof char?) exact-integer?)\n\n )",
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"How do you know if you are at the end of a consecutive group of characters?"
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"sampleTestCase": "[\"a\",\"a\",\"b\",\"b\",\"c\",\"c\",\"c\"]",
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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>. 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