How to approach this problem

#1

How should one approach this problem? Should I like generate all the substrings and then check all of them if they are a cb number? Or there is some other better way to do this?

#2

Hey Shubham!
Yes you’re thinking in the right direction, you have to generate substring of every length. THen create a bool function that will return true if the passed number is a CB number otherwise return false.

#3

I tried that and as given in question we need to eliminate the string that has already occurred and is cb number. I did that. Still some test cases are failing. Please help me out. Here’s the link to my code: https://ide.codingblocks.com/s/111079

#4


Please check the comments in the following code