mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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187 lines
16 KiB
JSON
187 lines
16 KiB
JSON
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"title": "Maximum Length of a Concatenated String with Unique Characters",
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"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> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["un","iq","ue"]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> 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</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["cha","r","act","ers"]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> Possible longest valid concatenations are "chaers" ("cha" + "ers") and "acters" ("act" + "ers").\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["abcdefghijklmnopqrstuvwxyz"]\n<strong>Output:</strong> 26\n<strong>Explanation:</strong> The only string in arr has all 26 characters.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 16</code></li>\n\t<li><code>1 <= arr[i].length <= 26</code></li>\n\t<li><code>arr[i]</code> contains only lowercase English letters.</li>\n</ul>\n",
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"exampleTestcases": "[\"un\",\"iq\",\"ue\"]\n[\"cha\",\"r\",\"act\",\"ers\"]\n[\"abcdefghijklmnopqrstuvwxyz\"]",
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"code": "-spec max_length(Arr :: [unicode:unicode_binary()]) -> integer().\nmax_length(Arr) ->\n .",
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"You can try all combinations and keep mask of characters you have.",
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"You can use DP."
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],
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