Use HashSet for duplication detection #769
Merged
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Description
The duplication detection is now amortized O(n) instead of O(n^2).
Does your commit message include the wording below to reference a specific issue in this repo?
No issue opened for this trivial change.
Related Pull Requests
Blame #693 for the crap implementation.
Does your pull request have unit tests?
This is a performance fix and thus cannot be unit tested.