output_description: Print the minimum number of elements that needs to be replaced.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      n
      v_1 v_2 ... v_n
attempt: from sys import stdin
  import collections
  
  n, v_list = stdin.readlines()
  n = int(n.rstrip())
  v_list = [int(v) for v in v_list.rstrip().split()]
  # print(n, v_list)
  
  v_list_odd = [v_list[i] for i in range(1, n, 2)]
  v_list_even = [v_list[i] for i in range(0, n, 2)]
  
  c_odd = collections.Counter(v_list_odd)
  c_even = collections.Counter(v_list_even)
  
  most_common_odd = c_odd.most_common()
  most_common_even = c_even.most_common()
  # print(most_common_even)
  # print(most_common_odd)
  
  if most_common_odd[0][0] == most_common_even[0][0]:
      print(n / 2)
  else:
      odd_cnt = most_common_odd[0][1]
      even_cnt = most_common_even[0][1]
      print(n - odd_cnt - even_cnt)
  
problem_description: Statement
  
  A sequence a_1,a_2,... ,a_n is said to be /\/\/\/ when the following
  conditions are satisfied:
  
    * For each i = 1,2,..., n-2, a_i = a_{i+2}.
    * Exactly two different numbers appear in the sequence.
  
  You are given a sequence v_1,v_2,...,v_n whose length is even. We would like
  to make this sequence /\/\/\/ by replacing some of its elements. Find the
  minimum number of elements that needs to be replaced.
samples: [{"input": "4\n    3 1 3 2", "output": "1\n    \n\nThe sequence 3,1,3,2 is not /\\/\\/\\/, but we can make it /\\/\\/\\/ by replacing\none of its elements: for example, replace the fourth element to make it\n3,1,3,1.\n\n* * *"}, {"input": "6\n    105 119 105 119 105 119", "output": "0\n    \n\nThe sequence 105,119,105,119,105,119 is /\\/\\/\\/.\n\n* * *"}, {"input": "4\n    1 1 1 1", "output": "2\n    \n\nThe elements of the sequence 1,1,1,1 are all the same, so it is not /\\/\\/\\/."}]