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 collections import defaultdict
  
  _ = input()
  ns = list(map(int, input().split()))
  
  # ns = [4, 1, 3, 2]
  
  xs = ns[0::2]
  ys = ns[1::2]
  
  ans = 0
  counts = defaultdict(int)
  for x in xs:
      counts[x] += 1
  
  max_numx = -1
  max_x = -1
  for key in counts.keys():
      if counts[key] > max_numx:
          max_numx = counts[key]
          max_x = key
  
  del counts[max_x]
  if counts:
      max_numx2 = max(counts.values())
  else:
      max_numx2 = 0
  
  counts = defaultdict(int)
  for y in ys:
      counts[y] += 1
  max_numy = -1
  max_y = -1
  for key in counts.keys():
      if counts[key] > max_numy:
          max_numy = counts[key]
          max_y = key
  
  del counts[max_y]
  if counts:
      max_numy2 = max(counts.values())
  else:
      max_numy2 = 0
  
  if max_x != max_y:
      print(len(ns) - max_numx - max_numy)
  else:
      print(min(len(ns) - max_numx - max_numy2, len(ns) - max_numx2 - max_numy))
  
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 /\\/\\/\\/."}]