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<p>Implement a function to check if a binary tree is a binary search tree.</p>
<p><strong>Example&nbsp;1:</strong></p>
<pre>
<strong>Input:</strong>
2
/ \
1 3
<strong>Output:</strong> true
</pre>
<p><strong>Example&nbsp;2:</strong></p>
<pre>
<strong>Input:</strong>
5
/ \
1 4
&nbsp; / \
&nbsp; 3 6
<strong>Output:</strong> false
<strong>Explanation:</strong> Input: [5,1,4,null,null,3,6].
&nbsp; the value of root node is 5, but its right child has value 4.</pre>