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

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        "question": {
            "questionId": "3337",
            "questionFrontendId": "3084",
            "categoryTitle": "Algorithms",
            "boundTopicId": 2689641,
            "title": "Count Substrings Starting and Ending with Given Character",
            "titleSlug": "count-substrings-starting-and-ending-with-given-character",
            "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",
            "translatedTitle": "统计以给定字符开头和结尾的子字符串总数",
            "translatedContent": "<p>给你一个字符串 <code>s</code> 和一个字符 <code>c </code>。返回在字符串 <code>s</code> 中并且以 <code>c</code> 字符开头和结尾的<span data-keyword=\"substring-nonempty\">非空子字符串</span>的总数。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 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>输入：</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>输出：</strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">6</span></p>\n\n<p><strong>解释：</strong>以 <code>\"a\"</code> 开头和结尾的子字符串有： <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\">示例 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>输入：</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>输出：</strong><span class=\"example-io\" style=\"font-family: Menlo,sans-serif; font-size: 0.85rem;\">6</span></p>\n\n<p><strong>解释：</strong>字符串 <code>s</code> 中总共有 <code>6</code> 个子字符串，并且它们都以 <code>\"z\"</code> 开头和结尾。</p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</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> 和 <code>c</code> 均由小写英文字母组成。</li>\n</ul>\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.",
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