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Trie for Autocomplete Search
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Trie for Autocomplete Search

HardPython

Problem

Design and implement a Trie data structure to support autocomplete and search functionality for user-generated content on Roblox.

Implement trie_operations(operations). Each operation is ['insert', word], ['search', word], or ['autocomplete', prefix, k]. Return one result for each search or autocomplete operation, preserving query order. Words contain lowercase English letters, autocomplete results must be lexicographically ordered, and each word should appear at most once.

Constraints

  • 1 <= operations.length <= 5000
  • Each word and prefix contains 1 to 50 lowercase English letters
  • The total number of inserted characters is at most 100000
  • 0 <= k <= 50
  • Words may be inserted more than once
  • Autocomplete results must be unique and lexicographically ordered

Function Signature

def trie_operations(operations):
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