Merge pull request #725 from ironartisan/master

添加0530.二叉搜索树的最小绝对值差.md迭代Java解法

problems/0450.删除二叉搜索树中的节点.md

@@ -293,6 +293,32 @@ class Solution {
     }
 }
 ```
+```java
+// 解法2
+class Solution {
+  public TreeNode deleteNode(TreeNode root, int key) {
+    if (root == null) return root;
+    if (root.val == key) {
+      if (root.left == null) {
+        return root.right;
+      } else if (root.right == null) {
+        return root.left;
+      } else {
+        TreeNode cur = root.right;
+        while (cur.left != null) {
+          cur = cur.left;
+        }
+        cur.left = root.left;
+        root = root.right;
+        return root;
+      }
+    }
+    if (root.val > key) root.left = deleteNode(root.left, key);
+    if (root.val < key) root.right = deleteNode(root.right, key);
+    return root;
+  }
+}
+```
 
 ## Python