leetcode-problemset/leetcode-cn/originData/count-prefix-and-suffix-pairs-i.json

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            "questionId": "3309",
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            "categoryTitle": "Algorithms",
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            "title": "Count Prefix and Suffix Pairs I",
            "titleSlug": "count-prefix-and-suffix-pairs-i",
            "content": "<p>You are given a <strong>0-indexed</strong> string array <code>words</code>.</p>\n\n<p>Let&#39;s define a <strong>boolean</strong> function <code>isPrefixAndSuffix</code> that takes two strings, <code>str1</code> and <code>str2</code>:</p>\n\n<ul>\n\t<li><code>isPrefixAndSuffix(str1, str2)</code> returns <code>true</code> if <code>str1</code> is <strong>both</strong> a <span data-keyword=\"string-prefix\">prefix</span> and a <span data-keyword=\"string-suffix\">suffix</span> of <code>str2</code>, and <code>false</code> otherwise.</li>\n</ul>\n\n<p>For example, <code>isPrefixAndSuffix(&quot;aba&quot;, &quot;ababa&quot;)</code> is <code>true</code> because <code>&quot;aba&quot;</code> is a prefix of <code>&quot;ababa&quot;</code> and also a suffix, but <code>isPrefixAndSuffix(&quot;abc&quot;, &quot;abcd&quot;)</code> is <code>false</code>.</p>\n\n<p>Return <em>an integer denoting the <strong>number</strong> of index pairs </em><code>(i, j)</code><em> such that </em><code>i &lt; j</code><em>, and </em><code>isPrefixAndSuffix(words[i], words[j])</code><em> is </em><code>true</code><em>.</em></p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;a&quot;,&quot;aba&quot;,&quot;ababa&quot;,&quot;aa&quot;]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> In this example, the counted index pairs are:\ni = 0 and j = 1 because isPrefixAndSuffix(&quot;a&quot;, &quot;aba&quot;) is true.\ni = 0 and j = 2 because isPrefixAndSuffix(&quot;a&quot;, &quot;ababa&quot;) is true.\ni = 0 and j = 3 because isPrefixAndSuffix(&quot;a&quot;, &quot;aa&quot;) is true.\ni = 1 and j = 2 because isPrefixAndSuffix(&quot;aba&quot;, &quot;ababa&quot;) is true.\nTherefore, the answer is 4.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;pa&quot;,&quot;papa&quot;,&quot;ma&quot;,&quot;mama&quot;]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> In this example, the counted index pairs are:\ni = 0 and j = 1 because isPrefixAndSuffix(&quot;pa&quot;, &quot;papa&quot;) is true.\ni = 2 and j = 3 because isPrefixAndSuffix(&quot;ma&quot;, &quot;mama&quot;) is true.\nTherefore, the answer is 2.  </pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;abab&quot;,&quot;ab&quot;]\n<strong>Output:</strong> 0\n<strong>Explanation: </strong>In this example, the only valid index pair is i = 0 and j = 1, and isPrefixAndSuffix(&quot;abab&quot;, &quot;ab&quot;) is false.\nTherefore, the answer is 0.</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 50</code></li>\n\t<li><code>1 &lt;= words[i].length &lt;= 10</code></li>\n\t<li><code>words[i]</code> consists only of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "统计前后缀下标对 I",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong> 开始的字符串数组 <code>words</code> 。</p>\n\n<p>定义一个 <strong>布尔 </strong>函数 <code>isPrefixAndSuffix</code> ，它接受两个字符串参数 <code>str1</code> 和 <code>str2</code> ：</p>\n\n<ul>\n\t<li>当 <code>str1</code> 同时是 <code>str2</code> 的前缀（<span data-keyword=\"string-prefix\">prefix</span>）和后缀（<span data-keyword=\"string-suffix\">suffix</span>）时，<code>isPrefixAndSuffix(str1, str2)</code> 返回 <code>true</code>，否则返回 <code>false</code>。</li>\n</ul>\n\n<p>例如，<code>isPrefixAndSuffix(\"aba\", \"ababa\")</code> 返回 <code>true</code>，因为 <code>\"aba\"</code> 既是 <code>\"ababa\"</code> 的前缀，也是 <code>\"ababa\"</code> 的后缀，但是 <code>isPrefixAndSuffix(\"abc\", \"abcd\")</code> 返回<code> false</code>。</p>\n\n<p>以整数形式，返回满足 <code>i &lt; j</code> 且 <code>isPrefixAndSuffix(words[i], words[j])</code> 为 <code>true</code> 的下标对 <code>(i, j)</code> 的<strong> 数量 </strong>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"a\",\"aba\",\"ababa\",\"aa\"]\n<strong>输出：</strong>4\n<strong>解释：</strong>在本示例中，计数的下标对包括：\ni = 0 且 j = 1 ，因为 isPrefixAndSuffix(\"a\", \"aba\") 为 true 。\ni = 0 且 j = 2 ，因为 isPrefixAndSuffix(\"a\", \"ababa\") 为 true 。\ni = 0 且 j = 3 ，因为 isPrefixAndSuffix(\"a\", \"aa\") 为 true 。\ni = 1 且 j = 2 ，因为 isPrefixAndSuffix(\"aba\", \"ababa\") 为 true 。\n因此，答案是 4 。</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"pa\",\"papa\",\"ma\",\"mama\"]\n<strong>输出：</strong>2\n<strong>解释：</strong>在本示例中，计数的下标对包括：\ni = 0 且 j = 1 ，因为 isPrefixAndSuffix(\"pa\", \"papa\") 为 true 。\ni = 2 且 j = 3 ，因为 isPrefixAndSuffix(\"ma\", \"mama\") 为 true 。\n因此，答案是 2 。</pre>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [\"abab\",\"ab\"]\n<strong>输出：</strong>0\n<strong>解释：</strong>在本示例中，唯一有效的下标对是 i = 0 且 j = 1 ，但是 isPrefixAndSuffix(\"abab\", \"ab\") 为 false 。\n因此，答案是 0 。</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 50</code></li>\n\t<li><code>1 &lt;= words[i].length &lt;= 10</code></li>\n\t<li><code>words[i]</code> 仅由小写英文字母组成。</li>\n</ul>\n",
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                "Iterate through all index pairs <code>(i, j)</code>, such that <code>i < j</code>, and check <code>isPrefixAndSuffix(words[i], words[j])</code>.",
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