May 14, 2023 · Apr 25, 2023 · Apr 25, 2023 · Apr 27, 2023 · May 14, 2023 · May 14, 2023
diff --git a/problems/0530.二叉搜索树的最小绝对差.md b/problems/0530.二叉搜索树的最小绝对差.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -174,6 +174,39 @@ class Solution {
		}
		}
		```
	統一迭代法-中序遍历
	```Java
	class Solution {
	public int getMinimumDifference(TreeNode root) {
	Stack<TreeNode> stack = new Stack<>();
	TreeNode pre = null;
	int result = Integer.MAX_VALUE;

	if(root != null)
	stack.add(root);
	while(!stack.isEmpty()){
	TreeNode curr = stack.peek();
	if(curr != null){
	stack.pop();
	if(curr.right != null)
	stack.add(curr.right);
	stack.add(curr);
	stack.add(null);
	if(curr.left != null)
	stack.add(curr.left);
	}else{
	stack.pop();
	TreeNode temp = stack.pop();
	if(pre != null)
	result = Math.min(result, temp.val - pre.val);
	pre = temp;
	}
	}
	return result;
	}
	}
	```

		迭代法-中序遍历

		```java
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