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[mypy] Fix type annotations in `data_structures/binary_tree/lowest_common_ancestor.py` (#5757)

* Fix type annotations in lowest_common_ancestor.py

* Refactor line 53 in lowest_common_ancestor.py
D
Dylan Buchi committed
331fe6d3bc075ac2d91af766cf2bdf7df09f1281
Parent: 7954a3a
Committed by GitHub <noreply@github.com> on 11/3/2021, 8:34:08 PM