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Update the comments in
binary_search_tree and avl_tree.
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@@ -46,10 +46,10 @@ func (bst *binarySearchTree) search(num int) *TreeNode {
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// 循环查找,越过叶结点后跳出
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for node != nil {
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if node.Val < num {
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// 目标结点在 root 的右子树中
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// 目标结点在 cur 的右子树中
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node = node.Right
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} else if node.Val > num {
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// 目标结点在 root 的左子树中
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// 目标结点在 cur 的左子树中
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node = node.Left
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} else {
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// 找到目标结点,跳出循环
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