LeetCode - Same tree - GoldmanSachs - Easy - C+++

bool isSameTree(TreeNode* p, TreeNode* q) {
        if(p == NULL && q == NULL){
            return true;
        }else if((p == NULL && q!= NULL) || (p != NULL and q == NULL)){
            return false;
        }
        if(p -> val == q -> val){
            return isSameTree(p -> left, q -> left) && isSameTree(p -> right, q -> right);
        }
        return false;
    }