Cummalitive sum at negtaive index not initialized as 0 but as -2

#1

Sir , as told in the video im doing the same but when i initlaize int cumSum[100]={0}; but on line where currentsum=cumSum[j] - cumSum[i-1]; let say i = 1 and j=1
then cumSum[-1] should be zero but its coming as -2 which in turns ruining the whole answer please tell how to fix this

#2

Hey @mdhammad139
Yes we 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

*let say i=0;j=0 i meant to say instead of i=1 j=1

#4

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