Code is working but extra substring are also counted

#1

In 4991, both 499 and 991 are CB numbers but you can choose either 499 or 991, not both…how to include this restriction in the code…

#2

Hi Akshay,
See to check if the digit is already a part of the any other CB number, you can create an boolean array say, valid which store which digits till now has been a part of any other CB number.

#3

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