we can do it bitwise...
i can set the corresponding bit by 1 of any int ...
lets take
int ia,ib=0;
and set the a[i]th bit of ia as 1 ,
and similar for bth array and ib ...
and finally check.. if(ia==ib){permutation of each other}
hope this will work..
On Sun, May 20, 2012 at 1:39 AM, malay chakrabarti <m1234...@gmail.com>wrote:
> dat defeats the o(1) space constraint. :-)
> On May 19, 2012 8:05 PM, "HARSHIT PAHUJA" <hpahuja.mn...@gmail.com> wrote:
>
>> @malay --- we can do it by precomputing the prime arrays
>> ....................
>>
>> On Sun, May 20, 2012 at 1:10 AM, malay chakrabarti <m1234...@gmail.com>wrote:
>>
>>> method is ryt but to find ith prime u cannot to it in constant time.
>>> On May 19, 2012 7:30 PM, "HARSHIT PAHUJA" <hpahuja.mn...@gmail.com>
>>> wrote:
>>>
>>>> given 2 unsorted integer arrays a and b of equal size. Determine if b
>>>> is a permutation of a. Can this be done in O(n) time and O(1) space ?
>>>>
>>>>
>>>>
>>>>
>>>> please help me with my solution
>>>>
>>>>
>>>> suppose a -- 3 5 4
>>>> b -- 4 3 5
>>>>
>>>> now we replace a[i] with a[i]..th prime number and b with b[i] .. th
>>>> prime number
>>>>
>>>> now array a becomes 5 11 7
>>>> array b becomes 7 5 11
>>>>
>>>> now we take product of elements of array a and do the same with array
>>>> b elements
>>>> if product is equal then b is a permutation of a
>>>>
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>>
>>
>> --
>> HARSHIT PAHUJA
>> M.N.N.I.T.
>> ALLAHABAD
>>
>>
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