leetcode-problemset/leetcode-cn/originData/maximum-length-of-a-concatenated-string-with-unique-characters.json

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            "categoryTitle": "Algorithms",
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            "title": "Maximum Length of a Concatenated String with Unique Characters",
            "titleSlug": "maximum-length-of-a-concatenated-string-with-unique-characters",
            "content": "<p>You are given an array of strings <code>arr</code>. A string <code>s</code> is formed by the <strong>concatenation</strong> of a <strong>subsequence</strong> of <code>arr</code> that has <strong>unique characters</strong>.</p>\n\n<p>Return <em>the <strong>maximum</strong> possible length</em> of <code>s</code>.</p>\n\n<p>A <strong>subsequence</strong> is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;un&quot;,&quot;iq&quot;,&quot;ue&quot;]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> All the valid concatenations are:\n- &quot;&quot;\n- &quot;un&quot;\n- &quot;iq&quot;\n- &quot;ue&quot;\n- &quot;uniq&quot; (&quot;un&quot; + &quot;iq&quot;)\n- &quot;ique&quot; (&quot;iq&quot; + &quot;ue&quot;)\nMaximum length is 4.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;cha&quot;,&quot;r&quot;,&quot;act&quot;,&quot;ers&quot;]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> Possible longest valid concatenations are &quot;chaers&quot; (&quot;cha&quot; + &quot;ers&quot;) and &quot;acters&quot; (&quot;act&quot; + &quot;ers&quot;).\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [&quot;abcdefghijklmnopqrstuvwxyz&quot;]\n<strong>Output:</strong> 26\n<strong>Explanation:</strong> The only string in arr has all 26 characters.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= arr.length &lt;= 16</code></li>\n\t<li><code>1 &lt;= arr[i].length &lt;= 26</code></li>\n\t<li><code>arr[i]</code> contains only lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "串联字符串的最大长度",
            "translatedContent": "<p>给定一个字符串数组 <code>arr</code>，字符串 <code>s</code> 是将 <code>arr</code>&nbsp;的含有 <strong>不同字母</strong> 的&nbsp;<strong>子序列</strong> 字符串 <strong>连接</strong> 所得的字符串。</p>\n\n<p>请返回所有可行解 <code>s</code> 中最长长度。</p>\n\n<p><strong>子序列</strong> 是一种可以从另一个数组派生而来的数组，通过删除某些元素或不删除元素而不改变其余元素的顺序。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [\"un\",\"iq\",\"ue\"]\n<strong>输出：</strong>4\n<strong>解释：</strong>所有可能的串联组合是：\n- \"\"\n- \"un\"\n- \"iq\"\n- \"ue\"\n- \"uniq\" (\"un\" + \"iq\")\n- \"ique\" (\"iq\" + \"ue\")\n最大长度为 4。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [\"cha\",\"r\",\"act\",\"ers\"]\n<strong>输出：</strong>6\n<strong>解释：</strong>可能的解答有 \"chaers\" 和 \"acters\"。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [\"abcdefghijklmnopqrstuvwxyz\"]\n<strong>输出：</strong>26\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= arr.length &lt;= 16</code></li>\n\t<li><code>1 &lt;= arr[i].length &lt;= 26</code></li>\n\t<li><code>arr[i]</code>&nbsp;中只含有小写英文字母</li>\n</ul>\n",
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            "hints": [
                "You can try all combinations and keep mask of characters you have.",
                "You can use DP."
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