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DIY: Decoding a String

Explore how to decode nested encoded strings such as 3[a2[b]] by writing a function that expands patterns repeated multiple times. This lesson helps you develop skills in parsing and string manipulation, valuable for compiler functionalities and understanding complex input decoding.

Problem statement

Given an encoded string, return its decoded string.

The input string is encoded such that k[pattern] should be decoded to pattern repeatedly for k ...