The same technique proposed by Raj + sort PrefixSum array and process
it.

On 6 ноя, 21:41, Raj <[email protected]> wrote:
> Compute PrefixSum Array.
> PrefixSum[i]=a[0]+a[1]+a[2]+....+a[i-1]+a[i]
>
> Now problem reduces to finding two elements having same value.
>
> For  PrefixSum[i], search an element having value PrefixSum[i] in
> array PrefixSum from indices 0 to i-1.
> Linear search would cost O(n^2), balanced tree O(nlogn), hash O(n).

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