543. Diameter of Binary Tree

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LeetCode

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    private int depth(TreeNode node){
        if(node==null) return 0;
        return 1+Math.max(depth(node.left),depth(node.right));
    }
    public int diameterOfBinaryTree(TreeNode root) {
        if(root==null) return 0;
        int rootDepth=depth(root.left)+depth(root.right);
        int leftDepth=diameterOfBinaryTree(root.left);
        int rightDepth=diameterOfBinaryTree(root.right);
        return Math.max(rootDepth,Math.max(leftDepth,rightDepth));
    }
}

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