What is this line doing? csum[i] = csum[i-1]+p[i]

#1

I Did not get the logic behind this line

#2

Hey @JaveedYara it means that at ith index you are storing the value of number of primes till (I-1)th index and, +p[i] means That if p[i] is equal to 1 then that will increase the count csum[i] = csum[i-1] + 1 , or if it will be zero then csum[i] = csum[i-1]
Hope it will help you understanding this problem in a better approach :slight_smile:

#3

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