add sol

leetcode/leetcode75/BinarySearchTree/450.DeleteNodeInaBST/deleteNodeInaBST.go

@@ -0,0 +1,45 @@
+package main
+
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+
+type TreeNode struct {
+	Val   int
+	Left  *TreeNode
+	Right *TreeNode
+}
+
+func deleteNode(root *TreeNode, key int) *TreeNode {
+	if root == nil {
+		return nil
+	}
+	if root.Val > key {
+		root.Left = deleteNode(root.Left, key)
+		return root
+	}
+	if root.Val < key {
+		root.Right = deleteNode(root.Right, key)
+		return root
+	}
+	if root.Left == nil {
+		return root.Right
+	}
+	if root.Right == nil {
+		return root.Left
+	}
+	node := root.Right
+	for node.Left != nil {
+		node = node.Left
+	}
+	node.Left = root.Left
+	root = root.Right
+	return root
+}
+
+func main() {}