Could someone illustrate the XOR for question 2. I am a beginner to this.
Many thanks!
On Thu, Jun 9, 2011 at 4:58 PM, Piyush Sinha <ecstasy.piy...@gmail.com>wrote:
> Xoring it twice ...once with the elements in the file and then from i=1 to
> 4,000,000,000..the answer left is the missing number
>
> On Thu, Jun 9, 2011 at 4:46 PM, Dumanshu <duman...@gmail.com> wrote:
>
>> I dont think numbers are sorted in the 1st question. btw
>> @sunny: how will xor-ing give the ans? for 1st ques?
>>
>>
>> On Jun 9, 3:34 pm, sunny agrawal <sunny816.i...@gmail.com> wrote:
>> > yes, but using xor no need of ULL :)
>> >
>> > 2011/6/9 • » νιρυℓ « • <vipulmehta.1...@gmail.com>
>>
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > > Sum wont overflow, ULL range will include sum.
>> >
>> > > On Thu, Jun 9, 2011 at 3:52 PM, sunny agrawal <
>> sunny816.i...@gmail.com>wrote:
>>
>> >
>> > >> sum can overflow....
>> > >> Xor method can also be applied to Q1. no need of numbers to be
>> sorted.
>> >
>> > >> 2011/6/9 • » νιρυℓ « • <vipulmehta.1...@gmail.com>
>>
>> >
>> > >>> For 1.
>> > >>> sum the numbers in the file, subtract it from sum of first 4 billion
>> > >>> numbers.
>> >
>> > >>> On Thu, Jun 9, 2011 at 3:44 PM, Navneet Gupta <
>> navneetn...@gmail.com>wrote:
>>
>> >
>> > >>>> The answer to second question is simple. XORing all the elements
>> > >>>> should do it for you.
>> >
>> > >>>> On Thu, Jun 9, 2011 at 3:15 PM, Dumanshu <duman...@gmail.com>
>> wrote:
>> > >>>> > Q1. I have a file in which there are supposed to be 4 billion
>> > >>>> > numbers,
>> > >>>> > starting from 1 to 4,000,000,000 but unfortunately one number is
>> > >>>> > missing,
>> > >>>> > i.e there are only 3,999,999,999 numbers, I need to find the
>> missing
>> > >>>> > number.
>> >
>> > >>>> > Q2. I have an array consisting of 2n+1 elements. n elements in
>> it are
>> > >>>> > married, i.e they occur twice in the array, however there is one
>> > >>>> > element
>> > >>>> > which only appears once in the array. I need to find that number
>> in a
>> > >>>> > single pass using constant memory. {assume all are positive
>> numbers}
>> > >>>> > Eg :- 3 4 1 3 1 7 2 2 4
>> > >>>> > Ans:- 7
>> >
>> > >>>> > --
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>> > >>>> --
>> > >>>> --Navneet
>> >
>> > >>>> --
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>> > >>> --
>> > >>> Regards,
>> > >>> Vipul
>> >
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>> >
>> > >> --
>> > >> Sunny Aggrawal
>> > >> B-Tech IV year,CSI
>> > >> Indian Institute Of Technology,Roorkee
>> >
>> > >> --
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>> >
>> > > --
>> > > Regards,
>> > > Vipul
>> >
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>> > --
>> > Sunny Aggrawal
>> > B-Tech IV year,CSI
>> > Indian Institute Of Technology,Roorkee
>>
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>>
>
>
> --
> *Piyush Sinha*
> *IIIT, Allahabad*
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