Table of Contents

## How do you sort an integer array in place using quicksort algorithm?

Quick Sort

- Set the first index of the array to left and loc variable. Set the last index of the array to right variable.
- Start from the right of the array and scan the complete array from right to beginning comparing each element of the array with the element pointed by loc.

### Which algorithm is used for quick sort?

Overview of quicksort. Like merge sort, quicksort uses divide-and-conquer, and so it’s a recursive algorithm.

#### Which algorithm is better between quick sort and merge sort with respect to time and space complexity?

Merge sort is more efficient and works faster than quick sort in case of larger array size or datasets. Quick sort is more efficient and works faster than merge sort in case of smaller array size or datasets. Sorting method : The quick sort is internal sorting method where the data is sorted in main memory.

**How is quick sort implemented in C++?**

The key process in quickSort is partition(). Target of partitions is, given an array and an element x of array as pivot, put x at its correct position in sorted array and put all smaller elements (smaller than x) before x, and put all greater elements (greater than x) after x. All this should be done in linear time.

**What is Quick Sort explain with example?**

Quick Sort is a sorting algorithm, which is commonly used in computer science. Quick Sort is a divide and conquer algorithm. It creates two empty arrays to hold elements less than the pivot value and elements greater than the pivot value, and then recursively sort the sub arrays./span>

## What is the best case for quick sort?

n*log(n)

### What is the best case complexity for quick sort algorithm?

#### What is the order of quick sort in the worst case?

Quicksort

Animated visualization of the quicksort algorithm. The horizontal lines are pivot values. | |
---|---|

Class | Sorting algorithm |

Worst-case performance | O(n2) |

Best-case performance | O(n log n) (simple partition) or O(n) (three-way partition and equal keys) |

Average performance | O(n log n) |

**What is the advantage of bubble sort over other?**

Explanation: Optimised Bubble sort is one of the simplest sorting techniques and perhaps the only advantage it has over other techniques is that it can detect whether the input is already sorted. It is faster than other in case of sorted array and consumes less time to describe whether the input array is sorted or not.

**Which algorithm is better for Sorting between bubble sort and quicksort?**

Given that average case for Bubble Sort is the worst case for Quick Sort, it is safe to say that Quick Sort is the superior sorting algorithm. For short arrays (under 1,000 elements), the benefits of Quick Sort are minimal, and might be outweighed by it’s complexity, if the goal is readability.

## What is the best time complexity of bubble sort?

The space complexity for Bubble Sort is O(1), because only a single additional memory space is required i.e. for temp variable. Also, the best case time complexity will be O(n), it is when the list is already sorted.

### Why is it called Shell sort?

The shell sort, sometimes called the diminishing increment sort, improves on the insertion sort by breaking the original list into a number of smaller sublists, each of which is sorted using an insertion sort. The unique way that these sublists are chosen is the key to the shell sort.

#### How many passes does an insertion sort algorithm consist of?

How many passes does an insertion sort algorithm consist of? Explanation: An insertion algorithm consists of N-1 passes when an array of N elements is given.

**Is insertion sort a stable algorithm?**

Some Sorting Algorithms are stable by nature, such as Bubble Sort, Insertion Sort, Merge Sort, Count Sort etc. Other non-comparison based sorts such as Counting Sort maintain stability by ensuring that the Sorted Array is filled in a reverse order so that elements with equivalent keys have the same relative position./span>

**Which is the slowest sorting procedure?**

Discussion Forum

Que. | Out of the following, the slowest sorting procedure is |
---|---|

b. | Heap Sort |

c. | Shell Sort |

d. | Bubble Sort |

Answer:Bubble Sort |

## What is an external sorting algorithm?

External sorting is a class of sorting algorithms that can handle massive amounts of data. External sorting is required when the data being sorted do not fit into the main memory of a computing device (usually RAM) and instead they must reside in the slower external memory, usually a hard disk drive.

### What is the disadvantage of selection sort?

What is the disadvantage of selection sort? Explanation: As the input size increases, the performance of selection sort decreases. Explanation: Since the input array is not sorted, bubble sort takes 5 iterations and selection sort takes 4(n-1) iterations.

#### How can we modify the insertion sort to be a stable sort algorithm?

Any comparison based sorting algorithm which is not stable by nature can be modified to be stable by changing the key comparison operation so that the comparison of two keys considers position as a factor for objects with equal key or by tweaking it in a way such that its meaning doesn’t change and it becomes stable as …/span>

**Is bubble sort a stable algorithm?**

Bubble sort is a stable algorithm. A sorting algorithm is said to be stable if two objects with equal keys appear in the same order in sorted output as they appear in the input array to be sorted.

**Why is bubble sort bad?**

The thing that makes bubble-sort particularly bad is that it is not only worst-and-average-case O(N^2), but nearly always O(N^2). The optimisation to exit early if there was no swaps is an addition to the simplest version of the algorithm, and only exits significantly early for a tiny subset of cases.

## What is a stable sorting technique?

A sorting algorithm is said to be stable if two objects with equal keys appear in the same order in sorted output as they appear in the input unsorted array. Some Sorting Algorithm is stable by nature like Insertion Sort, Merge Sort and Bubble Sort etc.

### Which is the best sorting technique?

Time Complexities of Sorting Algorithms:

Algorithm | Best | Worst |
---|---|---|

Bubble Sort | Î©(n) | O(n^2) |

Merge Sort | Î©(n log(n)) | O(n log(n)) |

Insertion Sort | Î©(n) | O(n^2) |

Selection Sort | Î©(n^2) | O(n^2) |

#### Why heap sort is not stable?

Heap sort is not stable because operations in the heap can change the relative order of equivalent keys. The binary heap can be represented using array-based methods to reduce space and memory usage. Heap sort is an in-place algorithm, where inputs are overwritten using no extra data structures at runtime.

**What is in place sorting algorithm?**

(algorithm) Definition: A sort algorithm in which the sorted items occupy the same storage as the original ones. These algorithms may use o(n) additional memory for bookkeeping, but at most a constant number of items are kept in auxiliary memory at any time. Also known as sort in place.