# Data Structures :: Searching & Sorting

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Selection sort and quicksort both fall into the same category of sorting algorithms. What is this category?

AO(n log n) sorts

BDivide-and-conquer sorts

CInterchange sorts

| | | Asked In BOA (Bank of America) |

Explanation:

Selection sort is not O(n log n) and not a Divide-conquer sort too and Average time of quicksort is not quadratic.

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Which of the following algorithmic paradigm is used in the merge sort?

BBackTracking

CGreedy method

DDivide and Conquer

| | | Asked In Commvault |

Explanation:

Here is no explanation for this answer

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What is the worst case performance of Selection sort algorithm?

AO(log n)

BO(n* n)

CO(n)

DO(n log n)

| | | Asked In Commvault |

Explanation:

Here is no explanation for this answer

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Let P be a quick sort program to sort numbers in ascending order using the first element as the pivot. Let t1 and t2 be the number of comparisons made by P for the input [1 2 3 4 5] and [4 1 5 3 2] respectively. Which one of the following holds?

At1 = 5

Bt1 < t2

Ct1 > t2

Dt1 = t2

| | | Asked In nagarro |

Explanation:

When first element or last element is chosen as pivot, Quick Sort's worst case occurs for the sorted arrays.

In every step of quick sort, numbers are divided as per the following recurrence.

T(n) = T(n-1) + O(n)

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Which one of the following statements about the function Process Array is CORRECT?
Consider the C function given below. Assume the array listA contains (n>0) elements, sorted in ascending order.

int Process array (int * list A, int x, int n)
{
int i, j, k;
i =0;j=n-1;
do {
k = (i+j)/2;
if (x<=list A[k])
j=k-1;
if (list A[k] <=x)
i =k+1;
} while (i <=j);
if (list A[k] == x)
return (k);
else
return -1;
}

AIt will run into an infinite loop when x is not in listA

BIt is an implementation of binary search.

CIt will always find the maximum element in listA.

DIt will return -1 even when x is present in listA.

| | | Asked In nagarro |

Explanation:

Here is no explanation for this answer

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What sorting algos have their best and worst case times equal ?

Aheap and selection sort

Binsersition sort & merge sort

Cmerge sort and heap sort

DNone of these

| | | Asked In Wipro |

Explanation:

O(nlogn) for mergesort and heap sort

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What data structures you should use for dictionary searching and it should be capable of doing spell check also ?

Aarray

BHashing

DTree

| | | Asked In Wipro |

Explanation:

Here is no explanation for this answer

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In worst case Quick Sort has order

AO(n log n)

B$$O\left(n^{2}\right)$$

CO(log n)

D$$O\left(\frac{n^{2}}{4}\right)$$

| | | Asked In |

Explanation:

The worst case time complexity of a typical implementation of QuickSort is O(n2)

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A sort which relatively passes through a list to exchange the first element with any element less than it and then repeats with a new first element is called

Ainsertion sort.

Bselection sort.

Cheap sort.

Dquick sort.

| | | Asked In |

Explanation:

The right answer is the Selection Sort.

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Which of the following sorting algorithms does not have a worst case running time of O(n^2)?

AInsertion sort

BMerge sort

CQuick sort

DBubble sort

| | | Asked In |

Explanation:

Here is no explanation for this answer

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