LeetCode104: Maximum Depth of Binary Tree

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */
int maxDepth(struct TreeNode* root) {
    if (root == NULL)
    {
        return 0;
    }
    int left = maxDepth(root->left);
    int right = maxDepth(root->right);
    if (left > right) {
        left = left+1;
        return left;
    }else
    {
        right = right;
        return right;
    }
}