How to Solve Frequencies of Shortest Supersequences Problem
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Frequencies of Shortest Supersequences
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 t...
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Understanding the Frequencies of Shortest Supersequences Problem
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Problem Statement
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.
Frequencies of Shortest Supersequences
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Examples
words = ["ab","ba"][[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]]The two SCSs are "aba" and "bab". The output is the letter frequencies for each one.
words = ["aa","ac"][[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]]The two SCSs are "aac" and "aca". Since they are permutations of each other, keep only "aac".
words = ["aa","bb","cc"][[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]]"aabbcc" and all its permutations are SCSs.
Constraints
1 <= words.length <= 256words[i].length == 2All strings in words will altogether be composed of no more than 16 unique lowercase letters.All strings in words are unique.How Interview Coder Helps with Leetcode Problems
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