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: def put(len=int(input()), arys=input()):
      return [int(_) for _ in arys.split(" ")]
  
  
  def solve(ary):
      if len(set(ary)) < 2:
          return len(ary) // 2
  
      freq = {}
      nums = list(set(ary))
      for _ in nums:
          freq[_] = ary.count(_)
  
      even, odd = [], []
      for i, _ in enumerate(ary):
          if i % 2 == 0:
              even.append(_)
          else:
              odd.append(_)
  
      if odd[0] != even[0] and len(set(odd)) == len(set(even)):
          return 0
  
      curr_max = 0
      most_freq_key = 0
  
      for n, f in freq.items():
          if curr_max < f:
              curr_max = f
              most_freq_key = n
  
      freq.pop(most_freq_key)
  
      curr_max = 0
      sec_freq_key = 0
  
      for n, f in freq.items():
          if curr_max < f:
              curr_max = f
              sec_freq_key = n
  
      e_size, o_size = len(even), len(odd)
  
      return min(
          e_size - even.count(most_freq_key) + o_size - odd.count(sec_freq_key),
          e_size - even.count(sec_freq_key) + o_size - odd.count(most_freq_key),
      )
  
  
  print(solve(put()))
  
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 /\\/\\/\\/."}]