#include <stdio.h>
#include <stdlib.h>
struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
};
static int maxDepth(struct TreeNode* root)
{
if (root == NULL) {
return 0;
}
int l = maxDepth(root->left) + 1;
int r = maxDepth(root->right) + 1;
return l > r ? l : r;
}
int main(void)
{
printf("%d\n", maxDepth(NULL));
return 0;
}
