#! /usr/bin/env python
#coding=utf-8
#计数排序
def CountingSort(a, b, k):
#c=[0]*(k+1) #let c[0...k] be an all 0 array
#c=[0 for i in range(0,k+1)]
c=[]
for i in range(k+1):
c.append(0)
for j in range(len(a)):
c[a[j]] = c[a[j]] + 1
for i in range(1, k+1):
c[i] = c[i] + c[i-1]
for j in range(len(a)-1, -1, -1):
b[c[a[j]]-1] = a[j]#!!!!!减一是关键
c[a[j]] = c[a[j]] - 1
print b
if __name__ == '__main__':
a=[2, 5, 3, 0, 2, 3, 0, 3]
#b=[0]*len(a)
b=[None for i in range(len(a))]
print "编程素材网测试结果:"
CountingSort(a, b, max(a))
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