mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
18 KiB
JSON
181 lines
18 KiB
JSON
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"questionFrontendId": "3084",
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"boundTopicId": null,
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"title": "Count Substrings Starting and Ending with Given Character",
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"titleSlug": "count-substrings-starting-and-ending-with-given-character",
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"content": "<p>You are given a string <code>s</code> and a character <code>c</code>. Return <em>the total number of <span data-keyword=\"substring-nonempty\">substrings</span> of </em><code>s</code><em> that start and end with </em><code>c</code><em>.</em></p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\" style=\"border-color: var(--border-tertiary); border-left-width: 2px; color: var(--text-secondary); font-size: .875rem; margin-bottom: 1rem; margin-top: 1rem; overflow: visible; padding-left: 1rem;\">\n<p><strong>Input: </strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">s = "abada", c = "a"</span></p>\n\n<p><strong>Output: </strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">6</span></p>\n\n<p><strong>Explanation:</strong> Substrings starting and ending with <code>"a"</code> are: <code>"<strong><u>a</u></strong>bada"</code>, <code>"<u><strong>aba</strong></u>da"</code>, <code>"<u><strong>abada</strong></u>"</code>, <code>"ab<u><strong>a</strong></u>da"</code>, <code>"ab<u><strong>ada</strong></u>"</code>, <code>"abad<u><strong>a</strong></u>"</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\" style=\"border-color: var(--border-tertiary); border-left-width: 2px; color: var(--text-secondary); font-size: .875rem; margin-bottom: 1rem; margin-top: 1rem; overflow: visible; padding-left: 1rem;\">\n<p><strong>Input: </strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">s = "zzz", c = "z"</span></p>\n\n<p><strong>Output: </strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">6</span></p>\n\n<p><strong>Explanation:</strong> There are a total of <code>6</code> substrings in <code>s</code> and all start and end with <code>"z"</code>.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 10<sup>5</sup></code></li>\n\t<li><code>s</code> and <code>c</code> consist only of lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abada\"\n\"a\"\n\"zzz\"\n\"z\"",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n long long countSubstrings(string s, char c) {\n \n }\n};",
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"code": "class Solution(object):\n def countSubstrings(self, s, c):\n \"\"\"\n :type s: str\n :type c: str\n :rtype: int\n \"\"\"\n ",
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"code": "class Solution:\n def countSubstrings(self, s: str, c: str) -> int:\n ",
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"code": "public class Solution {\n public long CountSubstrings(string s, char c) {\n \n }\n}",
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"lang": "JavaScript",
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"langSlug": "javascript",
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"code": "/**\n * @param {string} s\n * @param {character} c\n * @return {number}\n */\nvar countSubstrings = function(s, c) {\n \n};",
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"lang": "TypeScript",
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"langSlug": "typescript",
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"code": "function countSubstrings(s: string, c: string): number {\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 $s\n * @param String $c\n * @return Integer\n */\n function countSubstrings($s, $c) {\n \n }\n}",
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"lang": "Swift",
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"langSlug": "swift",
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"code": "class Solution {\n func countSubstrings(_ s: String, _ c: Character) -> Int {\n \n }\n}",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun countSubstrings(s: String, c: Char): Long {\n \n }\n}",
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class Solution {\n int countSubstrings(String s, String c) {\n \n }\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func countSubstrings(s string, c byte) int64 {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String} s\n# @param {Character} c\n# @return {Integer}\ndef count_substrings(s, c)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def countSubstrings(s: String, c: Char): 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_substrings(s: String, c: char) -> i64 {\n \n }\n}",
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"code": "-spec count_substrings(S :: unicode:unicode_binary(), C :: char()) -> integer().\ncount_substrings(S, C) ->\n .",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec count_substrings(s :: String.t, c :: char) :: integer\n def count_substrings(s, c) do\n \n end\nend",
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"hints": [
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"Count the number of characters <code>'c'</code> in string <code>s</code>, let’s call it <code>m</code>.",
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"We can select <code>2</code> numbers <code>i</code> and <code>j</code> such that <code>i <= j</code> are the start and end indices of substring. Note that <code>i</code> and <code>j</code> can be the same.",
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"The answer is <code>m * (m + 1) / 2</code>."
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],
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"sampleTestCase": "\"abada\"\n\"a\"",
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