Min-Max
Write an algorithm that finds both the smallest and
largest numbers in a list of n numbers and with complexity
T(n) is at most about (1.5)n comparisons.
Answer Posted / ashekur rahman
Time Complexity T(n) <= 3n/2
Proof:
We will calculate comparison in three steps.
1) compare pairwise will divide two sub array.
2) linear search of first sub array
3) linear search of second sub array
For even number of elements,
step 1 needs n/2 comparisons where both sub array contains
n/2 number of elements. Step 2 or 3 needs (n/2 - 1)
comparisons by linear search.
T(n) = n/2 + 2(n/2 - 1)
= 3n/2 - 1
Again,
For odd number of elements,
step 1 needs (n/2 + 1) comparison.
Now if first sub array contains n/2 number of elements then
second sub array contains (n/2 + 1) number of elements
or if first sub array contains (n/2 + 1) number of elements
then second sub array contains n/2 number of elements
Therefore,
T(n) = (n/2 + 1) + (n/2 + 1 - 1) + (n/2 - 1)
= 3n/2
So, T(n) = 3n/2 - 1, if n is even number
and T(n) = 3n/2, if n is odd number
| Is This Answer Correct ? | 29 Yes | 4 No |
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