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Grokking the Coding Interview Patterns

Solution: Decode String

Understand how to decode strings encoded with nested repeat patterns by using stacks to manage substrings and repeat counts. This lesson teaches a systematic approach to process digits, brackets, and characters to produce the fully decoded string effectively, handling complexity and ensuring correctness.

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Statement

Given an encoded string, return its decoded version. The encoding rule follows the pattern: k[encoded string]k[encoded~string], where the encoded stringencoded~string is repeated exactly kk times.

Note: The kk is guaranteed to be a positive integer.

Assume that the input string is always ...