leetcode-problemset/leetcode/originData/count-substrings-starting-and-ending-with-given-character.json

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            "title": "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>&nbsp;</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 = &quot;abada&quot;, c = &quot;a&quot;</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>&quot;a&quot;</code> are: <code>&quot;<strong><u>a</u></strong>bada&quot;</code>, <code>&quot;<u><strong>aba</strong></u>da&quot;</code>, <code>&quot;<u><strong>abada</strong></u>&quot;</code>, <code>&quot;ab<u><strong>a</strong></u>da&quot;</code>, <code>&quot;ab<u><strong>ada</strong></u>&quot;</code>, <code>&quot;abad<u><strong>a</strong></u>&quot;</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 = &quot;zzz&quot;, c = &quot;z&quot;</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>&quot;z&quot;</code>.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> and <code>c</code> consist&nbsp;only of lowercase English letters.</li>\n</ul>\n",
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            "exampleTestcases": "\"abada\"\n\"a\"\n\"zzz\"\n\"z\"",
            "categoryTitle": "Algorithms",
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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": "/**\n * @param {string} s\n * @param {character} c\n * @return {number}\n */\nvar countSubstrings = function(s, c) {\n    \n};",
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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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                    "code": "class Solution {\n    func countSubstrings(_ s: String, _ c: Character) -> Int {\n        \n    }\n}",
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                    "code": "class Solution {\n    fun countSubstrings(s: String, c: Char): Long {\n        \n    }\n}",
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                    "lang": "Go",
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                    "code": "func countSubstrings(s string, c byte) int64 {\n    \n}",
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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": "Racket",
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                    "code": "-spec count_substrings(S :: unicode:unicode_binary(), C :: char()) -> integer().\ncount_substrings(S, C) ->\n  .",
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            "hints": [
                "Count the number of characters <code>'c'</code> in string <code>s</code>, let’s call it <code>m</code>.",
                "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.",
                "The answer is <code>m * (m + 1) / 2</code>."
            ],
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            "sampleTestCase": "\"abada\"\n\"a\"",
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