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Solution: Word Pattern

Understand how to determine if a given string follows a specific pattern by establishing a one-to-one mapping between pattern characters and words through hash maps. This lesson helps you implement and analyze an efficient solution to a common interview problem, mastering bijection verification with optimal time and space complexity.

Statement

You are given a pattern and a string, s. You need to determine whether the string s follows the same pattern.

A string s is said to follow a pattern if a bijection exists between a character in the pattern and a non-empty word in s.

  • Each character in the pattern must map to exactly one unique word in s.

  • Each word in s must map to exactly one unique character in pattern.

  • No ...