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How to Solve Frequencies of Shortest Supersequences Problem
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LeetCode ProblemFrequencies 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 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.
ArrayStringBit ManipulationGraphTopological SortEnumeration
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Problem Breakdown
Understanding the Frequencies of Shortest Supersequences Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
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.
HardProblem #3435
LeetCodeFrequencies of Shortest Supersequences
Related Topics
ArrayStringBit ManipulationGraphTopological SortEnumeration
How Phantom Code Helps
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Examples
# 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]]
# 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]]
# 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]]
Constraints
1 <= words.length <= 256
words[i].length == 2
All strings in words will altogether be composed of no more than 16 unique lowercase letters.
All strings in words are unique.
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Solve Frequencies of Shortest Supersequences — You are given an array of strings words. Find all shortest common supersequences...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
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Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
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How does Phantom Code help when I'm struggling with Frequencies of Shortest Supersequences style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
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