leetcode-problemset/leetcode-cn/originData/find-maximum-number-of-string-pairs.json

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        "question": {
            "questionId": "2847",
            "questionFrontendId": "2744",
            "categoryTitle": "Algorithms",
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            "title": "Find Maximum Number of String Pairs",
            "titleSlug": "find-maximum-number-of-string-pairs",
            "content": "<p>You are given a <strong>0-indexed</strong> array <code>words</code> consisting of <strong>distinct</strong> strings.</p>\n\n<p>The string <code>words[i]</code> can be paired with the string <code>words[j]</code> if:</p>\n\n<ul>\n\t<li>The string <code>words[i]</code> is equal to the reversed string of <code>words[j]</code>.</li>\n\t<li><code>0 &lt;= i &lt; j &lt; words.length</code>.</li>\n</ul>\n\n<p>Return <em>the <strong>maximum</strong> number of pairs that can be formed from the array </em><code>words</code><em>.</em></p>\n\n<p>Note that&nbsp;each string can belong in&nbsp;<strong>at most one</strong> pair.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;cd&quot;,&quot;ac&quot;,&quot;dc&quot;,&quot;ca&quot;,&quot;zz&quot;]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> In this example, we can form 2 pair of strings in the following way:\n- We pair the 0<sup>th</sup> string with the 2<sup>nd</sup> string, as the reversed string of word[0] is &quot;dc&quot; and is equal to words[2].\n- We pair the 1<sup>st</sup> string with the 3<sup>rd</sup> string, as the reversed string of word[1] is &quot;ca&quot; and is equal to words[3].\nIt can be proven that 2 is the maximum number of pairs that can be formed.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;ab&quot;,&quot;ba&quot;,&quot;cc&quot;]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> In this example, we can form 1 pair of strings in the following way:\n- We pair the 0<sup>th</sup> string with the 1<sup>st</sup> string, as the reversed string of words[1] is &quot;ab&quot; and is equal to words[0].\nIt can be proven that 1 is the maximum number of pairs that can be formed.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> words = [&quot;aa&quot;,&quot;ab&quot;]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> In this example, we are unable to form any pair of strings.\n</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>words[i].length == 2</code></li>\n\t<li><code>words</code>&nbsp;consists of distinct strings.</li>\n\t<li><code>words[i]</code>&nbsp;contains only lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "最大字符串配对数目",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong>&nbsp;开始的数组&nbsp;<code>words</code>&nbsp;，数组中包含 <strong>互不相同</strong>&nbsp;的字符串。</p>\n\n<p>如果字符串&nbsp;<code>words[i]</code>&nbsp;与字符串 <code>words[j]</code>&nbsp;满足以下条件，我们称它们可以匹配：</p>\n\n<ul>\n\t<li>字符串&nbsp;<code>words[i]</code>&nbsp;等于&nbsp;<code>words[j]</code>&nbsp;的反转字符串。</li>\n\t<li><code>0 &lt;= i &lt; j &lt; words.length</code></li>\n</ul>\n\n<p>请你返回数组 <code>words</code>&nbsp;中的&nbsp;<strong>最大</strong>&nbsp;匹配数目。</p>\n\n<p>注意，每个字符串最多匹配一次。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>words = [\"cd\",\"ac\",\"dc\",\"ca\",\"zz\"]\n<b>输出：</b>2\n<strong>解释：</strong>在此示例中，我们可以通过以下方式匹配 2 对字符串：\n- 我们将第 0 个字符串与第 2 个字符串匹配，因为 word[0] 的反转字符串是 \"dc\" 并且等于 words[2]。\n- 我们将第 1 个字符串与第 3 个字符串匹配，因为 word[1] 的反转字符串是 \"ca\" 并且等于 words[3]。\n可以证明最多匹配数目是 2 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>words = [\"ab\",\"ba\",\"cc\"]\n<b>输出：</b>1\n<b>解释：</b>在此示例中，我们可以通过以下方式匹配 1 对字符串：\n- 我们将第 0 个字符串与第 1 个字符串匹配，因为 words[1] 的反转字符串 \"ab\" 与 words[0] 相等。\n可以证明最多匹配数目是 1 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<b>输入：</b>words = [\"aa\",\"ab\"]\n<b>输出：</b>0\n<strong>解释：</strong>这个例子中，无法匹配任何字符串。\n</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>words[i].length == 2</code></li>\n\t<li><code>words</code>&nbsp;包含的字符串互不相同。</li>\n\t<li><code>words[i]</code>&nbsp;只包含小写英文字母。</li>\n</ul>\n",
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                "Notice that array words consist of distinct strings.",
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