Problem: Decode String
Explore how to decode strings encoded with nested repeat patterns using a stack data structure in Go. Learn to manage nested contexts by pushing and popping state from the stack, handle multi-digit repeat counts, and reconstruct the final decoded string. This lesson helps you understand stack operations in practical applications and implement efficient string decoding algorithms.
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Statement
Given an encoded string s, return its decoded string.
The encoding rule follows the format k[encoded_string], where the encoded_string enclosed within the square brackets is repeated exactly k times. The value k is guaranteed to be a positive integer.
You may assume that the input string is always valid: there are no extra whitespace characters, and all square brackets are well formed. Additionally, the original data contains no digit characters; digits appear only as repeat counts (k). For instance, inputs such as 3a or 2[4] will not occur.
The test cases are constructed such that the length of the decoded output never exceeds
Note: Nested encodings are possible, such as
k1[string1 k2[string2]], where inner patterns are decoded first before the outer repetition is applied.
Constraints:
s.lengthsconsists of lowercase English letters, digits, and square brackets'['and']'sis guaranteed to be a valid inputAll integers in
sare in the range...