Vikas is right!
while (n) is equal to (while n!=0)
you have 2n compares!
בתאריך יום שני, 1 באוקטובר 2012 12:12:21 UTC+2, מאת vikas:
>
> still there is no improvement, compiler will generate the code to compare
> with zero here. what you have accomplished is , hide it from human eyes
>
> On Monday, 1 October 2012 15:25:09 UTC+5:30, Navin Kumar wrote:
>>
>> @atul:
>> still it won't compare 0 th element. Slight modification in your code:
>>
>> n=*sizeof(arr)*;
>> do
>> {
>> if(elem==arr[*--n*])
>> print found;
>>
>> }while(n);
>>
>> On Mon, Oct 1, 2012 at 9:50 AM, atul anand <atul.8...@gmail.com> wrote:
>>
>>> yes, but there no need of checking outside the loop
>>>
>>> n=sizeof(arr)-1;
>>> do
>>> {
>>> if(elem==arr[n])
>>> print found;
>>> n--;
>>>
>>> }while(n);
>>>
>>>
>>>
>>> On Mon, Oct 1, 2012 at 9:33 AM, Navin Kumar <algorit...@gmail.com>wrote:
>>>
>>>> @atul: keep one more checking outside loop for element at 0 th index.
>>>> Because when n = 0 the your loop come out from the loop without comparing
>>>> it.
>>>>
>>>>
>>>> On Mon, Oct 1, 2012 at 8:55 AM, atul anand <atul.8...@gmail.com> wrote:
>>>>
>>>>> n=sizeof(arr);
>>>>> n--;
>>>>>
>>>>> while(n)
>>>>> {
>>>>> if(elem=arr[n])
>>>>> print found;
>>>>>
>>>>> n--;
>>>>>
>>>>> }
>>>>>
>>>>> On Sun, Sep 30, 2012 at 2:56 PM, רפי וינר <rafiw...@gmail.com> wrote:
>>>>>
>>>>>> Hi
>>>>>> i was in an interview and was given a simple function
>>>>>> int arrExsits(int* arr,int size,int elem){
>>>>>> for (int i=0;i<size;++i)
>>>>>> if(elem==arr[i])
>>>>>> return i;
>>>>>> return -1;
>>>>>> }
>>>>>> this function does 2n compares
>>>>>> n- the if statment
>>>>>> n-check that i is smaller then size
>>>>>> i was suppose to give an optimal (less compares) solution so i gave
>>>>>>
>>>>>> int arrExsits(int* arr,int size,int elem){
>>>>>> if (arr[size-1]==elem)
>>>>>> return size-1;
>>>>>> arr[size-1]=elem]
>>>>>> for (int i=0;;++i)
>>>>>> if(elem==arr[i]){
>>>>>> if (i!=size-1)
>>>>>> return i;
>>>>>> return -1;
>>>>>> }
>>>>>> this solution works and it has n+2 compares the first one another n
>>>>>> and the second inner if.
>>>>>> they told me it's good (and I've passed) but they told just for my
>>>>>> knowledge that there is a better N compare solution.
>>>>>> I've searched the web but couldn't find it.
>>>>>> anybody knows?
>>>>>> Thanks
>>>>>>
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>>>>>
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>>
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