mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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175 lines
18 KiB
JSON
175 lines
18 KiB
JSON
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"questionId": "3540",
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"title": "Hash Divided String",
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"content": "<p>You are given a string <code>s</code> of length <code>n</code> and an integer <code>k</code>, where <code>n</code> is a <strong>multiple</strong> of <code>k</code>. Your task is to hash the string <code>s</code> into a new string called <code>result</code>, which has a length of <code>n / k</code>.</p>\n\n<p>First, divide <code>s</code> into <code>n / k</code> <strong><span data-keyword=\"substring-nonempty\">substrings</span></strong>, each with a length of <code>k</code>. Then, initialize <code>result</code> as an <strong>empty</strong> string.</p>\n\n<p>For each <strong>substring</strong> in order from the beginning:</p>\n\n<ul>\n\t<li>The <strong>hash value</strong> of a character is the index of that characte<!-- notionvc: 4b67483a-fa95-40b6-870d-2eacd9bc18d8 -->r in the <strong>English alphabet</strong> (e.g., <code>'a' →<!-- notionvc: d3f8e4c2-23cd-41ad-a14b-101dfe4c5aba --> 0</code>, <code>'b' →<!-- notionvc: d3f8e4c2-23cd-41ad-a14b-101dfe4c5aba --> 1</code>, ..., <code>'z' →<!-- notionvc: d3f8e4c2-23cd-41ad-a14b-101dfe4c5aba --> 25</code>).</li>\n\t<li>Calculate the <em>sum</em> of all the <strong>hash values</strong> of the characters in the substring.</li>\n\t<li>Find the remainder of this sum when divided by 26, which is called <code>hashedChar</code>.</li>\n\t<li>Identify the character in the English lowercase alphabet that corresponds to <code>hashedChar</code>.</li>\n\t<li>Append that character to the end of <code>result</code>.</li>\n</ul>\n\n<p>Return <code>result</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = "abcd", k = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">"bf"</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>First substring: <code>"ab"</code>, <code>0 + 1 = 1</code>, <code>1 % 26 = 1</code>, <code>result[0] = 'b'</code>.</p>\n\n<p>Second substring: <code>"cd"</code>, <code>2 + 3 = 5</code>, <code>5 % 26 = 5</code>, <code>result[1] = 'f'</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = "mxz", k = 3</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">"i"</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The only substring: <code>"mxz"</code>, <code>12 + 23 + 25 = 60</code>, <code>60 % 26 = 8</code>, <code>result[0] = 'i'</code>.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= k <= 100</code></li>\n\t<li><code>k <= s.length <= 1000</code></li>\n\t<li><code>s.length</code> is divisible by <code>k</code>.</li>\n\t<li><code>s</code> consists only of lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abcd\"\n2\n\"mxz\"\n3",
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"categoryTitle": "Algorithms",
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"code": "class Solution(object):\n def stringHash(self, s, k):\n \"\"\"\n :type s: str\n :type k: int\n :rtype: str\n \"\"\"\n ",
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"code": "# @param {String} s\n# @param {Integer} k\n# @return {String}\ndef string_hash(s, k)\n \nend",
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"code": "object Solution {\n def stringHash(s: String, k: Int): String = {\n \n }\n}",
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"code": "-spec string_hash(S :: unicode:unicode_binary(), K :: integer()) -> unicode:unicode_binary().\nstring_hash(S, K) ->\n .",
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"hints": [
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"Try to find each substring.",
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"Use a for loop to find <code>hashedChar</code> of each substring.",
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"Find the answer using <code>hashedChar</code> of each substring."
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],
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"sampleTestCase": "\"abcd\"\n2",
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"metaData": "{\n \"name\": \"stringHash\",\n \"params\": [\n {\n \"name\": \"s\",\n \"type\": \"string\"\n },\n {\n \"type\": \"integer\",\n \"name\": \"k\"\n }\n ],\n \"return\": {\n \"type\": \"string\"\n }\n}",
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