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Back to Problems

1181. Before and After Puzzle

Medium46.2% AcceptancePremium
ArrayHash TableString
ProblemHints (2)SolutionsVideosCompanies (1)Notes

Problem Statement

Premium Problem

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Asked by:
C
Clutter

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Problem Hints

Use these hints if you're stuck. Try solving on your own first.

1
Hint 1

What if you check every pair of strings (bruteforce)?

2
Hint 2

For every two strings, check if they can form a puzzle by comparing their last and first words.

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My Brain after 569 Leetcode Problems

NeetCode
7:502,927,632 views

Asked By Companies

1 companies
C
Clutter

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Similar Problems

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Valid SudokuMedium
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More similar problems

Related Topics

ArrayHash TableStringSorting

Problem Stats

Acceptance Rate46.2%
DifficultyMedium
Companies1

Practice on LeetCode

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Frequently Asked Questions

Why is sorting required in Before and After Puzzle?

The problem requires the final list of merged phrases to be returned in lexicographical order. After generating all valid combinations, sorting ensures the output follows the expected order regardless of the generation sequence.

Is Before and After Puzzle asked in FAANG interviews?

Problems like Before and After Puzzle reflect common interview themes such as string manipulation, hash maps, and efficient pairing logic. While the exact problem may vary, similar patterns frequently appear in technical interviews at large tech companies.

What is the optimal approach for Before and After Puzzle?

The optimal approach uses hash maps to track phrases by their first and last words. This allows you to quickly find phrases that can be combined without checking every possible pair. Results are stored in a set and later sorted to meet the output requirements.

What data structure is best for solving Before and After Puzzle?

Hash tables are the most useful data structure because they allow efficient lookup of phrases based on starting or ending words. A set is also helpful to remove duplicate merged phrases before sorting the final results.