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1. Given two strings, are they permutat... Given two strings, are they permutation of each other

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   def is_permutation(input_string_1, input_string_2):

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       if len(input_string_1) != len(input_string_2):

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           return False

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       #assume ascii character set

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       char_count = [0]*256

2. Merge sort in python 3 Merge sort in python 3

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   def merge_sort(input_array):

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     array_size = len(input_array)

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     if array_size < 2 :

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       return

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     # divide