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44 lines (41 loc) · 923 Bytes
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Solution.cs
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44 lines (41 loc) · 923 Bytes
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/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution
{
public TreeNode BstFromPreorder(int[] preorder)
{
TreeNode root = null;
foreach (int val in preorder)
{
root = Insert(root, val);
}
return root;
}
TreeNode Insert(TreeNode node, int val)
{
if (node is null)
{
return new(val);
}
if (node.val < val)
{
node.right = Insert(node.right, val);
}
else if (node.val > val)
{
node.left = Insert(node.left, val);
}
return node;
}
}