Https://ide.codingblocks.com/s/256458

#1

what’s wrong in my code!!
or i mis understood the problem

#2

@abhay_091,

It is not prime numbers.

  1. 0 and 1 are not a CB number.
  2. 2,3,5,7,11,13,17,19,23,29 are CB numbers.
  3. Any number not divisible by the numbers in point 2( Given above) are also CB numbers.

Check for divisibility with only numbers given in 2.

Approach:

  1. check for all sub-strings of the given string of digits, starting from the all strings of length 1 and then gradually checking for the strings of increasing size:

1.1. check if the sub-string is CB number: for this, create a function
1.1.1. if sub-string is 1 or 0 return false.
1.1.2. if sub-string is any of the {2,3,5,7,11,13,17,19,23,29}, then return true.
1.1.3. if sub-string is divisible by any of the {2,3,5,7,11,13,17,19,23,29}, then return false.
1.1.4. return false

1.2. now if it is a substring:
1.2.1. call a function that marks the index as visited for indexes which are part of that CB number.

1.3. increment the count for CB number.

  1. Print the count
#3
#4

@abhay_091,

For the input:
11
44166181111

The CB numbers are:
41
61
11
11

Your code gives CB numbers as:
11

Use long instead of int. Also, call a function that marks the index as visited for indexes which are part of that CB number.

Instead of creating a list and storing all the substrings, check for divisibility and availability of index for each substring

#5

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