Problem in Finding CB Numbers

#1

What’s the problem in the code

5 out of 9 test cases failed.

#2

Please reply to doubt.

#3

Hi Vivek,
The basic idea is to check whether the substring is prime or not starting from 2.

In the sample test case, the string is 81615 here, 8161 is a prime number and 5 is also a prime number.
And check your if condition because you are skipping one character if the number is prime.

#4

not understood that where i am skipping 1 character.

#5

Hello Vivek,
In your code you are doing start = end, in this case you will skip one character, so you should be doing start= end-1. Also as I told you before, a cb number is a number which is prime. So you need to rewrite the cbnum function so that it checks whether ‘n’ is a prime number or not rather than just checking mod with prime numbers.

#6

Now what’s the problem in the code. 2 out of 9 test cases failed.