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Solution.cs
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36 lines (34 loc) · 933 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 int CountNodes(TreeNode root)
{
if (root == null) return 0;
int hLeft = GetHeightLeft(root);
int hRight = GetHeightRight(root);
if (hLeft == hRight) return (1 << hLeft) - 1;
return CountNodes(root.left) + CountNodes(root.right) + 1;
}
private int GetHeightLeft(TreeNode root)
{
if (root == null) return 0;
return 1 + GetHeightLeft(root.left);
}
private int GetHeightRight(TreeNode root)
{
if (root == null) return 0;
return 1 + GetHeightRight(root.right);
}
}