Leetcode 100 Same Tree

class Solution{public:bool isSameTree(TreeNode* root1, TreeNode* root2){if (root1 == NULL && root2 == NULL)return true;else if (root1 == NULL || root2 == NULL)return false;else{if (root1->val == root2->val)return isSameTree(root1->left, root2->left)& isSameTree(root1->right, root2->right);elsereturn false;}}};