def mergeSortR(nums): if len(nums) <= 1: return nums mid = len(nums)//2 leftList = nums[:mid] rightList = nums[mid:] leftList = mergeSortR(leftList) rightList = mergeSortR(rightList) i, j = 0, 0 newList = [] while i < len(leftList) and j < len(rightList): if le...
quicksort 的一般版本是 in-place 的 实际中,quicksort 的 O(nlgn) 常数项很小,所以比如 C 语言中常见常用 qsort Mergesort Mergesort 的伪码很容易在大名鼎鼎的 CLRS 上找到,最本质的要素就是拆分和合并为有序的array。代码看起来跟书上的伪码不太像,因为用了Python的一些语言特点,我觉得这是学算法很重要...
Below is a benchmark comparing the performance of Merge Sort and Quick Sort. benchmark.py import time import random def quick_sort(arr): if len(arr) <= 1: return arr pivot = arr[len(arr) // 2] left = [x for x in arr if x < pivot] middle = [x for x in arr if x == ...
Python Exercises, Practice and Solution: Write a Python program to sort a list of elements using the merge sort algorithm.
Merge Sort Code in Python, Java, and C/C++ Python Java C C++ # MergeSort in Python def mergeSort(array): if len(array) > 1: # r is the point where the array is divided into two subarrays r = len(array)//2 L = array[:r] M = array[r:] # Sort the two halves mergeSort(...
Merge sort with python 最近在看《算法导论》,同时又在学习Python,所以想到用PYTHON实现看过的算法,来练手。 PYTHON帮忙看看有没有需要改进的写法 #Suppose the index of current item is i, #then the parent index is int( (i-1)/2 ), #the left child index is 2*i+1,...
[i] = s[i] def mergeSort(s): tmp = s[:] mlen, n = 1, len(s) while mlen < n: mergeOnePass(s, tmp, mlen) mlen *= 2 mergeOnePass(tmp, s, mlen) mlen *= 2 if __name__ == '__main__': from random import shuffle s = range(100) shuffle(s) print s mergeSort(s)...
Eventually, I learned some ways that we could optimize these sorts, and am planning to apply those optimizations later. For example, heap sort can be done in-place(so, there would be no need for the separate heap structure). Another optimization would be, for quick sort, picking the ...
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python quicksort mergesort fibonacci bubble-sort insertion-sort binary-search sieve-of-eratosthenes bogosort Updated May 12, 2019 Python TashinParvez / DSA_1_UIU Star 30 Code Issues Pull requests All DSA topics covered in UIU DSA-I course, both lab and theory courses. Check DSA-2 Topics...