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@@ -12,7 +12,7 @@
"translatedContent": "<p>实现一个函数,检查一棵二叉树是否为二叉搜索树。</p><strong>示例 1:</strong><pre><strong>输入:</strong><br> 2<br> / &#92<br> 1 3<br><strong>输出:</strong> true<br></pre><strong>示例 2:</strong><pre><strong>输入:</strong><br> 5<br> / &#92<br> 1 4<br>  / &#92<br>  3 6<br><strong>输出:</strong> false<br><strong>解释:</strong> 输入为: [5,1,4,null,null,3,6]。<br>  根节点的值为 5 ,但是其右子节点值为 4 。</pre>",
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"difficulty": "Medium",
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@@ -155,7 +155,7 @@
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"hints": [
"如果使用前序遍历来遍历树,元素的顺序是正确的,这是否表明树实际上是有序的?有重复元素会发生什么?如果允许重复元素,它们必须位于特定的一边(通常是左边)。",
"作为一个二叉搜索树并不是说每个节点都满足left.value <= current.value < right就够了。左边的每个节点必须小于当前节点该节点还必须小于右边的所有节点。",