Count number of binary strings

#1


2 test cases not working,usedd fibonacci approach

#2

@Vibhuti0206 hey vibhuti do one thing approach this problem with dynamic approach this problem and class assignement have same logic so you should approach using dynamic approach refer this link.

#3

https://ide.codingblocks.com/s/168125,triedd using memoization,modifications required?

#4

https://ide.codingblocks.com/s/168128 , tried this approach also,error

#5

@Vibhuti0206 hey vibhuti see this
refer this there is small change .