Please help me to understand the use of csum there and also explain the function sum being written in the code

#1

Please help me to understand the use of csum there and also explain the function sum being written in the code.

#2

use of csum

resultant mixture of (a and b )and(c and d)= ( (a+b)%100 + (c+d)%100) )%100
so we can also write it as (a+b+c+d)%100
for that we make csum

sum function is doing the same thing

#3

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