Flashcards on Quicksort
Quicksort Explained: Analysis, Examples, and Optimization
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Quicksort Fundamentals
20 cards
Card 1
Question: What type of sorting algorithm is Quicksort?
Answer: Quicksort is a highly efficient, in-place, comparison-based sorting algorithm.
Card 2
Question: Who developed the Quicksort algorithm and in what year?
Answer: Tony Hoare in 1959.
Card 3
Question: What is the core principle behind Quicksort?
Answer: The core principle behind Quicksort is 'divide and conquer'.
Card 4
Question: What are the three main steps in Quicksort's 'divide and conquer' strategy?
Answer: 1. Divide 2. Conquer 3. Combine
Card 5
Question: Describe the 'Divide' step in Quicksort.
Answer: Pick an element from the array, called a 'pivot'. Rearrange the array elements such that all elements smaller than the pivot come before it, and all e
Card 6
Question: Describe the 'Conquer' step in Quicksort.
Answer: Recursively apply Quicksort to the sub-array of elements with smaller values and separately to the sub-array of elements with greater values.
Card 7
Question: Describe the 'Combine' step in Quicksort.
Answer: The sub-arrays are already sorted in place, so no explicit combine step is needed. The entire array becomes sorted once all recursive calls return.
Card 8
Question: Why is the choice of the pivot element crucial for Quicksort's performance?
Answer: The ideal pivot would be the median of the array, as it would divide the array into two sub-arrays of roughly equal size.
Card 9
Question: What are common strategies for choosing a pivot element in Quicksort?
Answer: Common choices include: first element, last element, middle element, random element, and median-of-three.
Card 10
Question: What is a disadvantage of choosing the first or last element as the pivot?
Answer: It can lead to worst-case performance if the array is already sorted or reverse-sorted.