Find Second largest number in array at most n+log₂(n)−2 comparisons [closed]

Answer 1

I shall give some examples for better understanding. :
example 1 :
>12 56 98 12 76 34 97 23
>>(12 56) (98 12) (76 34) (97 23)
>>> 56 98 76 97 
>>>> (56 98) (76 97)
>>>>> 98 97
>>>>>> 98   

The largest element is 98

Now compare with lost ones of the largest element 98. 97 will be the second largest.