Update tree.md

wuliaojizhi · web-flow · commit d6ab73bfa84e · 2023-05-18T17:39:50.000+08:00
diff --git a/docs/cs-basics/data-structure/tree.md b/docs/cs-basics/data-structure/tree.md
@@ -176,8 +176,8 @@ public void postOrder(TreeNode root){
 	if(root == null){
 		return;
 	}
-	postOrder(root.left);
 	postOrder(root.right);
+	postOrder(root.left);
 	system.out.println(root.data);
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -176,8 +176,8 @@ public void postOrder(TreeNode root){`
`176`	`176`	`if(root == null){`
`177`	`177`	`return;`
`178`	`178`	`}`
`179`		`- postOrder(root.left);`
`180`	`179`	`postOrder(root.right);`
	`180`	`+ postOrder(root.left);`
`181`	`181`	`system.out.println(root.data);`
`182`	`182`	`}`
`183`	`183`	```