mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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168 lines
16 KiB
JSON
168 lines
16 KiB
JSON
{
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"question": {
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"questionId": "2044",
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"questionFrontendId": "1915",
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"boundTopicId": null,
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"title": "Number of Wonderful Substrings",
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"titleSlug": "number-of-wonderful-substrings",
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"content": "<p>A <strong>wonderful</strong> string is a string where <strong>at most one</strong> letter appears an <strong>odd</strong> number of times.</p>\r\n\r\n<ul>\r\n\t<li>For example, <code>"ccjjc"</code> and <code>"abab"</code> are wonderful, but <code>"ab"</code> is not.</li>\r\n</ul>\r\n\r\n<p>Given a string <code>word</code> that consists of the first ten lowercase English letters (<code>'a'</code> through <code>'j'</code>), return <em>the <strong>number of wonderful non-empty substrings</strong> in </em><code>word</code><em>. If the same substring appears multiple times in </em><code>word</code><em>, then count <strong>each occurrence</strong> separately.</em></p>\r\n\r\n<p>A <strong>substring</strong> is a contiguous sequence of characters in a string.</p>\r\n\r\n<p> </p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "aba"\r\n<strong>Output:</strong> 4\r\n<strong>Explanation:</strong> The four wonderful substrings are underlined below:\r\n- "<u><strong>a</strong></u>ba" -> "a"\r\n- "a<u><strong>b</strong></u>a" -> "b"\r\n- "ab<u><strong>a</strong></u>" -> "a"\r\n- "<u><strong>aba</strong></u>" -> "aba"\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "aabb"\r\n<strong>Output:</strong> 9\r\n<strong>Explanation:</strong> The nine wonderful substrings are underlined below:\r\n- "<strong><u>a</u></strong>abb" -> "a"\r\n- "<u><strong>aa</strong></u>bb" -> "aa"\r\n- "<u><strong>aab</strong></u>b" -> "aab"\r\n- "<u><strong>aabb</strong></u>" -> "aabb"\r\n- "a<u><strong>a</strong></u>bb" -> "a"\r\n- "a<u><strong>abb</strong></u>" -> "abb"\r\n- "aa<u><strong>b</strong></u>b" -> "b"\r\n- "aa<u><strong>bb</strong></u>" -> "bb"\r\n- "aab<u><strong>b</strong></u>" -> "b"\r\n</pre>\r\n\r\n<p><strong>Example 3:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> word = "he"\r\n<strong>Output:</strong> 2\r\n<strong>Explanation:</strong> The two wonderful substrings are underlined below:\r\n- "<b><u>h</u></b>e" -> "h"\r\n- "h<strong><u>e</u></strong>" -> "e"\r\n</pre>\r\n\r\n<p> </p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 <= word.length <= 10<sup>5</sup></code></li>\r\n\t<li><code>word</code> consists of lowercase English letters from <code>'a'</code> to <code>'j'</code>.</li>\r\n</ul>",
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"translatedTitle": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 605,
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"exampleTestcases": "\"aba\"\n\"aabb\"\n\"he\"",
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"categoryTitle": "Algorithms",
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"name": "Hash Table",
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"name": "Bit Manipulation",
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},
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"name": "Prefix Sum",
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"code": "class Solution {\r\npublic:\r\n long long wonderfulSubstrings(string word) {\r\n \r\n }\r\n};",
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"code": "class Solution {\r\n public long wonderfulSubstrings(String word) {\r\n \r\n }\r\n}",
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"code": "class Solution(object):\r\n def wonderfulSubstrings(self, word):\r\n \"\"\"\r\n :type word: str\r\n :rtype: int\r\n \"\"\"",
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"code": "long long wonderfulSubstrings(char * word){\r\n\r\n}",
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"code": "# @param {String} word\r\n# @return {Integer}\r\ndef wonderful_substrings(word)\r\n \r\nend",
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"code": "class Solution {\r\n func wonderfulSubstrings(_ word: String) -> Int {\r\n \r\n }\r\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func wonderfulSubstrings(word string) int64 {\r\n \r\n}",
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"code": "object Solution {\r\n def wonderfulSubstrings(word: String): Long = {\r\n \r\n }\r\n}",
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"lang": "Kotlin",
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"code": "class Solution {\r\n fun wonderfulSubstrings(word: String): Long {\r\n \r\n }\r\n}",
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"lang": "Rust",
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"code": "impl Solution {\r\n pub fn wonderful_substrings(word: String) -> i64 {\r\n \r\n }\r\n}",
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"code": "class Solution {\r\n\r\n /**\r\n * @param String $word\r\n * @return Integer\r\n */\r\n function wonderfulSubstrings($word) {\r\n \r\n }\r\n}",
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "function wonderfulSubstrings(word: string): number {\r\n\r\n};",
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{
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"langSlug": "racket",
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"code": "(define/contract (wonderful-substrings word)\r\n (-> string? exact-integer?)\r\n\r\n )",
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}
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"hints": [
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"For each prefix of the string, check which characters are of even frequency and which are not and represent it by a bitmask.",
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"Find the other prefixes whose masks differs from the current prefix mask by at most one bit."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "\"aba\"",
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"metaData": "{\n \"name\": \"wonderfulSubstrings\",\n \"params\": [\n {\n \"name\": \"word\",\n \"type\": \"string\"\n }\n ],\n \"return\": {\n \"type\": \"long\"\n }\n}",
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. 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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