Regarding first execution

#1

during the first execution of
currSum = cumSum[j] - cumSum[i-1]

it becomes currsum = cumsum[0] - cumsum[0-1]
how is that possible?

please correct me !

#2

@khushi20
Yes have to add one constraint which Sir missed

if(i>=1)
current_sum = cum_sum[j] + cum_sum[i-1];
else
current_sum= cum_sum[j] ;

#3

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