* feat: Binary tree node sum (#7020)
* feat: Sum of all nodes in binary tree explanation (#7020)
* [pre-commit.ci] auto fixes from pre-commit.com hooks
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* Update data_structures/binary_tree/binary_tree_node_sum.py
Co-authored-by: Christian Clauss <cclauss@me.com>
* refactor: Change replace method with `__iter__` overriding (#7020)
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Co-authored-by: Christian Clauss <cclauss@me.com>
