CPP- Divisible Subarrays,Pigeonhole Problem

#1

in this question what things are used such as #define ll long long, ll a[1000005],prefixsum[1000005],memset?

can i get a link from which i can understand this because i think this question is more of competetive programming…

#2

Hello @itsexp_2302,

  1. #define is a preprocessors directives.
    You can study it in detail at this link.

  2. memset: you must have heard this while learning arrays, 2D arrays and vectors.
    This is used to initialize them with either 0 or -1.
    You can study it here.

Hope, this would help.
Give a like if you are satisfied.

#3

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