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Can anyone please explain this solution of hacker rank Binary Tree Nodes?

Author Votes Δ
Gordon Linoff 4 +1.13
Snehal Shukla 1 0.00
Aman Solanki 1 +0.87
Pranav Supsande 0 0.00
t.niese 0 -1.24
Last visited: Nov 27, 2022, 9:27:33 PM