Question

我只是写了另一个基数排序程序，这是我的代码：

#----------radix sort----------
def set_output():
    output_list = []
    for i in range (10):
        output_list.append(queue())
    return output_list

def set_radix(lists):
    output_list = set_output()
    for queue in lists:
        for num in queue:
            a = num[2]
            output_list[int(a)].add(num)
    return output_list

def sec_radix(input_list, i):
    output_list = set_output()
    for queue in input_list:
        while len(queue) > 0:
            num = queue.after()
            a = num[i]
            output_list[int(a)].add(num)
    return output_list

def done_radix(num_list):
    return sec_radix(sec_radix(set_radix(num_list), 1), 0)

python shell一直告诉我＆＃34; IndexError：字符串索引超出范围＆＃34;，我的数字字符串是正确的。我认为我的def set_radix()功能有问题，但我无法找到它的位置？

Answer 1

这是一个基数排序编码，所以有人可以理解它。我从here偷了大部分内容。

def radixsort( aList ):
  RADIX = 10
  maxLength = False
  tmp , placement = -1, 1

  while not maxLength:
    maxLength = True
    # declare and initialize buckets
    buckets = [list() for _ in range( RADIX )]

    # split aList between lists
    for  i in aList:
      tmp = i // placement
      print ("i is " , i)
      print ("placement is " , placement)
      print ("tmp is ", tmp)
      print ("tmp % RADIX is ", tmp % RADIX)
      buckets[tmp % RADIX].append( i )
      if maxLength and tmp > 0:
        maxLength = False

    # empty lists into aList array
    a = 0
    for b in range( RADIX ):
      buck = buckets[b]
      for i in buck:
        aList[a] = i
        a += 1

    # move to next digit
    placement *= RADIX
  return aList



a = radixsort([18,5,100,3,1,19,6,0,7,4,2])
print(a)

我得到它的网站上的代码有一些问题来自％产生一个浮动。我怀疑从python 2到3的区别。

基数排序的python循环

1 个答案: