添加新题目

二叉树/翻转二叉树/main.go

@@ -0,0 +1,20 @@
+package main
+
+type TreeNode struct {
+	Val   int
+	Left  *TreeNode
+	Right *TreeNode
+}
+
+func main() {
+
+}
+func invertTree(root *TreeNode) *TreeNode {
+	if root == nil {
+		return nil
+	}
+
+	root.Left, root.Right = invertTree(root.Left), invertTree(root.Right)
+	root.Left, root.Right = root.Right, root.Left
+	return root
+}