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1

### GATE CSE 2013

Which of the following is the tightest upper bound that represents the number of swaps required to sort n numbers using selection sort?
A
O(log n)
B
O(n)
C
O(n log n)
D
O(n2)
2

### GATE CSE 2012

Let W(n) and A(n) denote respectively, the worst case and average case running time of an algorithm executed on an input of size n. Which of the following is ALWAYS TRUE?
A
$$A(n) = \Omega (W(n))$$
B
$$A(n) = \Theta (W(n))$$
C
$$A(n) = O (W(n))$$
D
$$A(n) = 0 (W(n))$$
3

### GATE CSE 2012

The worst case running time to search for an element in a balanced binary search tree with n2n elements is
A
$$\Theta (n\,\log \,n)$$
B
$$\Theta (n{2^n})$$
C
$$\Theta (n)$$
D
$$\Theta (\log \,n)$$
4

### GATE CSE 2010

Two alternate packages A and B are available for processing a database having 10k records. Package A requires 0.0001n2 time units and package B requires $$10n.\log _{10}^n$$ time units to process n records. What is the smallest value of k for which package B will be preferred over A?
A
12
B
10
C
6
D
5
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