Prefix Sum

Finding 0 Sum Subarrays

To find subarrays with 0 sum, find prefix sum values of all elements. Then while traversing, if the prefix sum value of any element equals that of another element later, the subarray in between is a 0-sum subarray. More formally:

For indices a and b where a < b:

If prefix[b] == prefix[a], sum(a, b, array) = 0 .

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