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並前往https://leetcode.com/problems/delete-nodes-and-return-forest/discuss/1588538/Rust-Recursive-O(n)

Rust Recursive O(n) - LeetCode Discuss

None { let left = node.borrow().left.as_ref().unwrap().clone(); V.insert(left.borrow().val, left.clone()); } if node.borrow().right !=

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