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feat: Refactor Trie to O(1) Size, prevent duplicates, add lazy remove #784

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feat: Refactor Trie to O(1) Size, prevent duplicates, add lazy remove #784

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Zubayear
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This PR improves the Trie implementation:

  • Improve time complexity of Size() - O(1)
  • Remove unnecessary update of isLeaf flag on duplicate node
  • Empty string insertion prevented
  • Lazy remove decrements total count correctly
  • Added edge-case tests:
    • Empty string insertion
    • Substrings and shared prefixes
    • Removing non-existent words
    • Removing words sequentially
  • Added benchmark for Size()

This makes the Trie faster, safer, and properly tested.

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This PR is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

@github-actions github-actions bot added the stale label Sep 30, 2025
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@raklaptudirm raklaptudirm Awaiting requested review from raklaptudirm raklaptudirm is a code owner

@yanglbme yanglbme Awaiting requested review from yanglbme yanglbme is a code owner

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