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Update 0538.把二叉搜索树转换为累加树.md
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@ -396,6 +396,30 @@ impl Solution {
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}
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```
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迭代:
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```rust
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impl Solution {
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pub fn convert_bst(root: Option<Rc<RefCell<TreeNode>>>) -> Option<Rc<RefCell<TreeNode>>> {
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let mut cur = root.clone();
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let mut stack = vec![];
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let mut pre = 0;
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while !stack.is_empty() || cur.is_some() {
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while let Some(node) = cur {
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cur = node.borrow().right.clone();
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stack.push(node);
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}
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if let Some(node) = stack.pop() {
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pre += node.borrow().val;
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node.borrow_mut().val = pre;
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cur = node.borrow().left.clone();
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}
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}
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root
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}
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}
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```
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<p align="center">
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<a href="https://programmercarl.com/other/kstar.html" target="_blank">
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