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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"questionFrontendId": "2063",
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"boundTopicId": null,
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"title": "Vowels of All Substrings",
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"titleSlug": "vowels-of-all-substrings",
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"content": "<p>Given a string <code>word</code>, return <em>the <strong>sum of the number of vowels</strong> (</em><code>'a'</code>, <code>'e'</code><em>,</em> <code>'i'</code><em>,</em> <code>'o'</code><em>, and</em> <code>'u'</code><em>)</em> <em>in every substring of </em><code>word</code>.</p>\n\n<p>A <strong>substring</strong> is a contiguous (non-empty) sequence of characters within a string.</p>\n\n<p><strong>Note:</strong> Due to the large constraints, the answer may not fit in a signed 32-bit integer. Please be careful during the calculations.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "aba"\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> \nAll possible substrings are: "a", "ab", "aba", "b", "ba", and "a".\n- "b" has 0 vowels in it\n- "a", "ab", "ba", and "a" have 1 vowel each\n- "aba" has 2 vowels in it\nHence, the total sum of vowels = 0 + 1 + 1 + 1 + 1 + 2 = 6. \n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "abc"\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> \nAll possible substrings are: "a", "ab", "abc", "b", "bc", and "c".\n- "a", "ab", and "abc" have 1 vowel each\n- "b", "bc", and "c" have 0 vowels each\nHence, the total sum of vowels = 1 + 1 + 1 + 0 + 0 + 0 = 3.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> word = "ltcd"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no vowels in any substring of "ltcd".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= word.length <= 10<sup>5</sup></code></li>\n\t<li><code>word</code> consists of lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"similarQuestions": "[{\"title\": \"Number of Substrings Containing All Three Characters\", \"titleSlug\": \"number-of-substrings-containing-all-three-characters\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
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"exampleTestcases": "\"aba\"\n\"abc\"\n\"ltcd\"",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n long long countVowels(string word) {\n \n }\n};",
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"code": "class Solution(object):\n def countVowels(self, word):\n \"\"\"\n :type word: str\n :rtype: int\n \"\"\"\n ",
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"lang": "C",
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"langSlug": "c",
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"code": "\n\nlong long countVowels(char * word){\n\n}",
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"lang": "C#",
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"langSlug": "csharp",
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"code": "public class Solution {\n public long CountVowels(string word) {\n \n }\n}",
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {string} word\n * @return {number}\n */\nvar countVowels = function(word) {\n \n};",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String} word\n# @return {Integer}\ndef count_vowels(word)\n \nend",
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"lang": "Swift",
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"langSlug": "swift",
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"code": "class Solution {\n func countVowels(_ word: String) -> Int {\n \n }\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func countVowels(word string) int64 {\n \n}",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def countVowels(word: String): Long = {\n \n }\n}",
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"lang": "Kotlin",
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"code": "class Solution {\n fun countVowels(word: String): Long {\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 count_vowels(word: String) -> i64 {\n \n }\n}",
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Solution {\n\n /**\n * @param String $word\n * @return Integer\n */\n function countVowels($word) {\n \n }\n}",
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "function countVowels(word: string): number {\n\n};",
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"code": "defmodule Solution do\n @spec count_vowels(word :: String.t) :: integer\n def count_vowels(word) do\n\n end\nend",
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"hints": [
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"Since generating substrings is not an option, can we count the number of substrings a vowel appears in?",
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"How much does each vowel contribute to the total sum?"
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"sampleTestCase": "\"aba\"",
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