Quick sort

Divide and conquer algorithm
works by selecting a pivot element and partitioning the other elements into two sub arrays,sub arrays are sorted recursive ly in place
not stable(relative order not maintained)
doesn't require extra space
Time complexity
- average case = O(nlogn)
- Worst case = O(n^2)
pivot selection:
- mostly at last element
- medians of median: guarantees pivots nears middle of the data
Variants:
- Iterative Quick Sort:

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