You are given an array of strings words. Find all shortest common supersequences (SCS) of words that are not permutations of each other.
A shortest common supersequence is a string of minimum length that contains each string in words as a subsequence.
Return a 2D array of integers freqs that represent all the SCSs. Each freqs[i] is an array of size 26, representing the frequency of each letter in the lowercase English alphabet for a single SCS. You may return the frequency arrays in any order.
Example 1:
Input: words = ["ab","ba"]
Output: [[1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[2,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]
Explanation:
The two SCSs are "aba" and "bab". The output is the letter frequencies for each one.
Example 2:
Input: words = ["aa","ac"]
Output: [[2,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]
Explanation:
The two SCSs are "aac" and "aca". Since they are permutations of each other, keep only "aac".
Example 3:
Input: words = ["aa","bb","cc"]
Output: [[2,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]
Explanation:
"aabbcc" and all its permutations are SCSs.
Constraints:
1 <= words.length <= 256words[i].length == 2words will altogether be composed of no more than 16 unique lowercase letters.words are unique.Solutions for this problem are being prepared.
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