Unnecessary if condition

#1

I want to know is it necessary to take the first if condition where if arr[i]==0 and len == 0 then we make len= 1

#2

nhi i feel it is one of the base condition
suppose the array has elements
0 1 3 -3 -1 0 2
then
a single element with value 0 would be considered as subarray with sum 0

yeh walli condition yaha useful h

#3

iss point peh pre walla sum non zero ho sakta h

#4

okay i think i got it

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