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: N = int(input())
  v = list(map(int, input().rstrip().split()))
  count_even = {}
  count_odd = {}
  if v.count(v[0]) == N:
      print(N // 2)
      exit()
  for i in range(N):
      num = v[i]
      if i % 2 == 0:
          value = count_odd.get(num)
          if value == None:
              count_odd[num] = 1
          else:
              count_odd[num] += 1
      else:
          value = count_even.get(num)
          if value == None:
              count_even[num] = 1
          else:
              count_even[num] += 1
  count_even = sorted(count_even.items(), key=lambda x: x[1], reverse=True)
  count_odd = sorted(count_odd.items(), key=lambda x: x[1], reverse=True)
  if count_even[0][0] == count_odd[0][0]:
      a, b = count_even[0][1], count_odd[0][1]
      if a > b:
          tmp = count_odd[0]
          count_odd[0] = count_odd[1]
          count_odd[1] = tmp
      else:
          tmp = count_even[0]
          count_even[0] = count_even[1]
          count_even[1] = tmp
  count_even = [x[1] for x in count_even]
  count_odd = [x[1] for x in count_odd]
  answer = 0
  if len(count_odd) > 1:
      for i in range(1, len(count_odd)):
          answer += count_odd[i]
  if len(count_even) > 1:
      for i in range(1, len(count_even)):
          answer += count_even[i]
  print(answer)
  
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 /\\/\\/\\/."}]