Please explain this condition i.e. if(pre==0) length=max(length,i+1;

#1

Please explain this condition i.e. if(pre==0) length=max(length,i+1;

#2

@cbcao263
Suppose the array is
2,-2,3
you encounter 2 , sum is 2; // i = 0;
you encounter -2, now sum is 0. // i = 1
In this case, this condition would trigger.
and length=max(length,i+1);

#3

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