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31 lines (30 loc) · 760 Bytes
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Solution.cs
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31 lines (30 loc) · 760 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
{
int ret = 0;
public int DiameterOfBinaryTree(TreeNode root)
{
MaxDepth(root);
return ret;
}
int MaxDepth(TreeNode root)
{
if (root == null) return 0;
int leftDepth = MaxDepth(root.left);
int rightDepth = MaxDepth(root.right);
ret = Math.Max(ret, leftDepth + rightDepth);
return Math.Max(leftDepth, rightDepth) + 1;
}
}