Explain the algorithm of csum array

#1

explain the algorithm behind the csum loop for printing sum with their respective indices

#2

hi @prajwalsingh226_b93d74431f6edd96,
suppose array is [1,2,3,4,5];
csum array will be [1,3,6,11,15]

now you want to calculate between any 2 points say index = 2 and index = 4
so ans will be csum[4] - csum[2-1] = 15-3 = 12 which is sum of (3+4+5) in o(1) time

#3

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