1239. Maximum Length of a Concatenated String with Unique Characters
Problem Statement
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.
Return the maximum possible length of s
.
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.
Example 1:
Example 2:
Example 3:
Constraints:
1 <= arr.length <= 16
1 <= arr[i].length <= 26
arr[i]
contains only lowercase English letters.
Intuition
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Approach 1:
Approach 2:
Approach 3:
Approach 4:
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