Negative modulus

#1

I didn’t get why he did sum%=n and again sum = (sum+n)%n and what all Prateek Bhaiya said about modulus of negative numbers

#2

And also that we should be storing the sum separately right? Why didn’t we need that?

#3

@ankurguria when we have to take the modulus of negative number we add the number from which we are taking modulo and then take modulo.
in this problem we dont need to store sum we just count which sum occurs how many times,since we are takin modulo with n all sums will be less than n.

#4

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