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Flatten Nested Tags Efficiently
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Flatten Nested Tags Efficiently

MediumPython

Problem

Given an array of nested category tags, write an efficient algorithm to flatten the structure and remove duplicates for Licorne Society.

Implement flatten_category_tags(tags). The input is a list containing strings or arbitrarily nested lists of strings. Return a flat list containing each tag once, preserving its first occurrence order.

Constraints

  • 0 <= number of top-level elements <= 1,000
  • The total number of nested lists and tags is at most 10,000
  • Each tag is a non-empty string
  • Nesting depth may be greater than one
  • Preserve the first occurrence order

Function Signature

def flatten_category_tags(tags):
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