26 lines
872 B
Rust
26 lines
872 B
Rust
// https://leetcode.com/problems/search-in-a-binary-search-tree/
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use super::util::tree::{TreeNode, to_tree};
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// Iterating method
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pub fn search_bst(root: Option<Rc<RefCell<TreeNode>>>, val: i32) -> Option<Rc<RefCell<TreeNode>>> {
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let mut r = root.clone();
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while let Some(node) = r {
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if node.borrow().val == val { return Some(node); }
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if node.borrow().val > val {
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r = node.borrow().left.clone();
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} else {
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r = node.borrow().right.clone();
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}
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}
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None
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}
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// Recursive Approach
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pub fn search_bst(root: Option<Rc<RefCell<TreeNode>>>, val: i32) -> Option<Rc<RefCell<TreeNode>>> {
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if let Some(n) = &root {
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if n.borrow().val > val { return Self::search_bst(n.borrow().left.clone(), val); }
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if n.borrow().val < val { return Self::search_bst(n.borrow().right.clone(), val); }
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}
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root
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}
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