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QuickSort is an O(nlogn) efficient sorting algorithm, serving as systematic method for placing elements of an array in order. Quicksort is a comparison sort, meaning that it can sort items of any type for which a “less-than” relation (formally, a total order) is defined. In efficient implementations it is not a stable sort, meaning that the relative order of equal sort items is not preserved. Quicksort can operate in-place on an array, requiring small additional amounts of memory to perform the sorting. It is very similar to selection sort, except that it does not always choose worst-case partition.
Source: https://en.wikipedia.org/wiki/Quicksort
Below are 2 versions of the Quicksort Algorithm Implementation with Python. The first version is easy, but use more memory. The second version use the memory very efficiently.
I- QuickSort Algorithm Implementation with Python (Memory intensive version)

Output:
II- Quicksort Algorithm Implementation with Python (with Memory Optimisation)
III- QuickSort Algorithm Implementation with Python for Both Methods with duration captured
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Output
III- Most Efficient Quicksort implementation in Python on array of integer represented as string. Example: array=[“1″,”237373737″,”3″,”1971771717171717″,”0”]
6 31415926535897932384626433832795 1 3 10 3 5
1 3 3 5 10 31415926535897932384626433832795 Just to clarify that lambda
part, in case someone else doesn't understand how exactly string comparison works:'2' > '1'
isTrue
, but'2' > '10'
is alsoTrue
, as well as'2' > '1000'
. That's why the strings are sorted by length first, becauselen('2') < len('10')
. IV- Build up a sorted array, one element at a time. Print the array after each iteration of the insertion sort, i.e., whenever the next element has been inserted at its correct position


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List of Freely available programming books - What is the single most influential book every Programmers should read
- Bjarne Stroustrup - The C++ Programming Language
- Brian W. Kernighan, Rob Pike - The Practice of Programming
- Donald Knuth - The Art of Computer Programming
- Ellen Ullman - Close to the Machine
- Ellis Horowitz - Fundamentals of Computer Algorithms
- Eric Raymond - The Art of Unix Programming
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- The Art of Unix Programming
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- Don't Make Me Think
- Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
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- The C++ Programming Language (3rd edition) by Stroustrup
- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
- Framework Design Guidelines by Brad Abrams
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- Advanced Programming in the UNIX Environment by W. Richard Stevens
- Hackers and Painters: Big Ideas from the Computer Age
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- Alice in Wonderland by Lewis Carol
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- About Face - The Essentials of Interaction Design
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- The Tao of Programming
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- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
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- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
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- Smalltalk-80: The Language and its Implementation
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