In max sum array problem?

#1

in the max sum array problem?
when I =0, then cumsum[i-1] will become cumsum[-1] how is this possible?

#2

there is slight mistake in the video you need to add a if condition to make sure that cumulative_sum[-1] is not accessed
if(i == 0) cumsum[i] = a[i]
else cumsum[i] = a[i] + cumsum[i-1]

#3

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#4

here its okay
but i am saying in the second for loop where its written
sum=cumsum[j] - cumsum[i-1] ??

#5

yes we need to add the if condition wherever there is possibility of accessing -1

#6

then what should we write after the if condition

#7 
if(i == 0)
cumsum[i] = a[i]
#8

I am not saying here.
see in the nested for loop "sum=cumsum[j] - cumsum[i-1] " here what will we write

#9

Yes instead of “sum=cumsum[j] - cumsum[i-1]” an if else condition would come as mentioned in the first comment.