mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
18 KiB
JSON
186 lines
18 KiB
JSON
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"questionId": "2494",
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"title": "Sum of Prefix Scores of Strings",
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"content": "<p>You are given an array <code>words</code> of size <code>n</code> consisting of <strong>non-empty</strong> strings.</p>\n\n<p>We define the <strong>score</strong> of a string <code>word</code> as the <strong>number</strong> of strings <code>words[i]</code> such that <code>word</code> is a <strong>prefix</strong> of <code>words[i]</code>.</p>\n\n<ul>\n\t<li>For example, if <code>words = ["a", "ab", "abc", "cab"]</code>, then the score of <code>"ab"</code> is <code>2</code>, since <code>"ab"</code> is a prefix of both <code>"ab"</code> and <code>"abc"</code>.</li>\n</ul>\n\n<p>Return <em>an array </em><code>answer</code><em> of size </em><code>n</code><em> where </em><code>answer[i]</code><em> is the <strong>sum</strong> of scores of every <strong>non-empty</strong> prefix of </em><code>words[i]</code>.</p>\n\n<p><strong>Note</strong> that a string is considered as a prefix of itself.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["abc","ab","bc","b"]\n<strong>Output:</strong> [5,4,3,2]\n<strong>Explanation:</strong> The answer for each string is the following:\n- "abc" has 3 prefixes: "a", "ab", and "abc".\n- There are 2 strings with the prefix "a", 2 strings with the prefix "ab", and 1 string with the prefix "abc".\nThe total is answer[0] = 2 + 2 + 1 = 5.\n- "ab" has 2 prefixes: "a" and "ab".\n- There are 2 strings with the prefix "a", and 2 strings with the prefix "ab".\nThe total is answer[1] = 2 + 2 = 4.\n- "bc" has 2 prefixes: "b" and "bc".\n- There are 2 strings with the prefix "b", and 1 string with the prefix "bc".\nThe total is answer[2] = 2 + 1 = 3.\n- "b" has 1 prefix: "b".\n- There are 2 strings with the prefix "b".\nThe total is answer[3] = 2.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = ["abcd"]\n<strong>Output:</strong> [4]\n<strong>Explanation:</strong>\n"abcd" has 4 prefixes: "a", "ab", "abc", and "abcd".\nEach prefix has a score of one, so the total is answer[0] = 1 + 1 + 1 + 1 = 4.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= words.length <= 1000</code></li>\n\t<li><code>1 <= words[i].length <= 1000</code></li>\n\t<li><code>words[i]</code> consists of lowercase English letters.</li>\n</ul>\n",
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"categoryTitle": "Algorithms",
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"code": "# @param {String[]} words\n# @return {Integer[]}\ndef sum_prefix_scores(words)\n \nend",
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"code": "defmodule Solution do\n @spec sum_prefix_scores(words :: [String.t]) :: [integer]\n def sum_prefix_scores(words) do\n \n end\nend",
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"What data structure will allow you to efficiently keep track of the score of each prefix?",
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"Use a Trie. Insert all the words into it, and keep a counter at each node that will tell you how many times we have visited each prefix."
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