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@jrichter
jrichter / quicksort.py
Created March 3, 2013 06:29
quicksort - gets it sorted but wastes time
def quicksortTest(A,p,r):
print A
if (p<r):
q = partition(A,p,r)
print "********************************************** q=, ", q, " r=", r
quicksortTest(A,q+1,r)
if (p==r):
print "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! p = r", p, r
q = partition(A,p,r)
quicksortTest(A,0,q-1)
@jrichter
jrichter / quicksort.rb
Created March 5, 2013 04:35
2 different quicksort methods
# -*- coding: utf-8 -*-
def partition(array, left, right, pivotIndex)
pivot = array[pivotIndex]
array[pivotIndex], array[right] = array[right], array[pivotIndex]
r = right - 1
storeIndex = left # copied left use as index
(left..r).each do |i|
if array[i] < pivot
array[i], array[storeIndex] = array[storeIndex], array[i]
storeIndex += 1

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