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Using Counter () in Python to find minimal character stripping to make two lines of an anagram

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Examples:

 Input: str1 = "bcadeh" str2 = "hea" Output: 3 We need to remove b, c and d from str1. Input: str1 = "cddgk" str2 = "gcd" Output: 2 Input: str1 = "bca" str2 = "acb" Output: 0 

This problem has an existing solution, please refer to the section Counter () and Dictionary Data Structure, and the intersection property of the Set data structure. The approach is very simple,

  1. Convert each line to a dictionary data structure using the Counter (iterable) method.
  2. Count the number of keys in both dictionaries ( count1, count2) and count the number of keys common in both dictionaries.
  3. If no shared keys are found, this means we need to remove the count1 + count2 characters from both strings.
  4. Else (max (count1, count2) — countCommon) will be the number of characters to be removed
    1. # The function removes the minimum number of characters so that
      # two lines become an anagram

      from collections import Counter

      def removeChars (str1, str2): 

       

      # make dictionaries from both strings

        dict1 = Counter (str1)

        dict2 = Counter (str2)

        

        # extract keys from dict1 and dict2

      keys1 = dict1 .keys ()

      keys2 = dict2.keys ()

       

        # number of keys in both keylists

        count1 = len (keys1)

      count2 = len (keys2)

       

      # convert a list of keys in a set to find shared keys

      set1 = set (keys1)

      commonKeys = len (set1.intersection ( keys2))

       

      if (commonKeys = = 0 ):

      return count1 + count2

      else :

      return ( max (count1, count2) - commonKeys)

       
      # Driver program

      if __ name__ = = "__ main__" :

      str1 = ’bcadeh’  

        str2 = ’ hea’

        print removeChars (str1, str2)

      Output:

       3 

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