From c093fe4224e1a5006ffe0f84d6be0dd085ef09a7 Mon Sep 17 00:00:00 2001
From: Ly <952700304@qq.com>
Date: Fri, 21 Aug 2020 13:23:44 +0800
Subject: [PATCH] fix: three errors (#487)

---
 src/data-structures/tree/binary-search-tree/README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/data-structures/tree/binary-search-tree/README.md b/src/data-structures/tree/binary-search-tree/README.md
index 140e2d24..f3e448a9 100644
--- a/src/data-structures/tree/binary-search-tree/README.md
+++ b/src/data-structures/tree/binary-search-tree/README.md
@@ -223,7 +223,7 @@ end findMax
 inorder(root)
   Pre: root is the root node of the BST
   Post: the nodes in the BST have been visited in inorder
-  if root = ø
+  if root != ø
     inorder(root.left)
     yield root.value
     inorder(root.right)
@@ -237,7 +237,7 @@ end inorder
 preorder(root)
   Pre: root is the root node of the BST
   Post: the nodes in the BST have been visited in preorder
-  if root = ø
+  if root != ø
     yield root.value
     preorder(root.left)
     preorder(root.right)
@@ -251,7 +251,7 @@ end preorder
 postorder(root)
   Pre: root is the root node of the BST
   Post: the nodes in the BST have been visited in postorder
-  if root = ø
+  if root != ø
     postorder(root.left)
     postorder(root.right)
     yield root.value