give array integer num integer k return number contiguous subarray product element subarray strictly k Example 1input num 10526 k 100Output 8explanation the 8 subarray product 100 are10 5 2 6 10 5 5 2 2 6 5 2 6note 10 5 2 include product 100 strictly kExample 2input num 123 k 0output 0 Constraints1 numslength 3 1041 numsi 10000 k 106