{ "data": { "question": { "questionId": "1360", "questionFrontendId": "1239", "categoryTitle": "Algorithms", "boundTopicId": 37351, "title": "Maximum Length of a Concatenated String with Unique Characters", "titleSlug": "maximum-length-of-a-concatenated-string-with-unique-characters", "content": "

You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.

\n\n

Return the maximum possible length of s.

\n\n

A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements.

\n\n

 

\n

Example 1:

\n\n
\nInput: arr = ["un","iq","ue"]\nOutput: 4\nExplanation: All the valid concatenations are:\n- ""\n- "un"\n- "iq"\n- "ue"\n- "uniq" ("un" + "iq")\n- "ique" ("iq" + "ue")\nMaximum length is 4.\n
\n\n

Example 2:

\n\n
\nInput: arr = ["cha","r","act","ers"]\nOutput: 6\nExplanation: Possible longest valid concatenations are "chaers" ("cha" + "ers") and "acters" ("act" + "ers").\n
\n\n

Example 3:

\n\n
\nInput: arr = ["abcdefghijklmnopqrstuvwxyz"]\nOutput: 26\nExplanation: The only string in arr has all 26 characters.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "串联字符串的最大长度", "translatedContent": "

给定一个字符串数组 arr，字符串 s 是将 arr 的含有 不同字母 的 子序列 字符串 连接 所得的字符串。

\n\n

请返回所有可行解 s 中最长长度。

\n\n

子序列 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。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：arr = [\"un\",\"iq\",\"ue\"]\n输出：4\n解释：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
\n\n

示例 2：

\n\n
\n输入：arr = [\"cha\",\"r\",\"act\",\"ers\"]\n输出：6\n解释：可能的解答有 \"chaers\" 和 \"acters\"。\n
\n\n

示例 3：

\n\n
\n输入：arr = [\"abcdefghijklmnopqrstuvwxyz\"]\n输出：26\n
\n\n

 

\n\n

提示：

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