@divya: yes you're right my algo doesn't work for negative values
@amit: you're algo is not correct for negative values either since
when you find C[j] - C[i] =k
there is a constraint that j>i but your BST would not support that e.g. :
k=7
A[]={6,-7,8}
C[]={0,6,-1,7}
your result would be true because when you see 6 in C you search for
-1 you can find it in your BST but there is no subarray that sum up to
7
i think that in your solution we must keep the indexes with the values
of C in BST
On 6/23/10, divya jain <sweetdivya....@gmail.com> wrote:
> @amir
>
> ur algo works only for positive elements array..
>
> correct me if m wrong
>
> On 23 June 2010 00:28, Amir hossein Shahriari <
> amir.hossein.shahri...@gmail.com> wrote:
>
>> for each element find sum[i] which is the summation of all elements with
>> index less than or equal to i ( note that this array is always sorted)
>> this
>> can be done in O(n)
>> then sum[i]-sum[j] when j<i is the sum of range [j,i]
>> then for each sum[i] binary search for sum[i]-k in the array sum
>> which yields the overall running time of O(nlogn)
>>
>> On Tue, Jun 22, 2010 at 7:48 PM, sharad kumar
>> <sharad20073...@gmail.com>wrote:
>>
>>> How will you find the subarray whose sum is k in an array of negative and
>>> positive numbers
>>>
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