Deepak and Primes II

#1

I tried to solve Deepak and Primes II problem but I am getting wrong answer on submission please tell me what is the error. code is giving correct output for given test cases.
code link : https://ide.codingblocks.com/s/161725

#2

You should take care of small things like you are making ar[N] and then trying to access ar[N].
Please see your code carefully and remove errors.
Have a look at this code

#3

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#4

why are you doing this

#5

why are you doing this long long first=ceil(a/double(num))*num; for(long long j=first;j<=b;j+=prime[i])