private static void helper(LeetCode783TreeNode root)
{
if (root == null)
{
return;
}
helper(root.left);
if (pre != -1)
{
result = Math.Min(result, root.val - pre);
}
pre = root.val;
helper(root.right);
}
public LeetCode783TreeNode(int val = 0, LeetCode783TreeNode left = null, LeetCode783TreeNode right = null)
{
this.val = val;
this.left = left;
this.right = right;
}
public static int MinDiffInBST(LeetCode783TreeNode root)
{
helper(root);
return(result);
}
