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: #include <iostream>
  #include <vector>
  #include <string>
  #include <cmath>
  #include <algorithm>
  #include <tuple>
  using namespace std;
  typedef long long ll;
  #define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
  #define repd(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
  #define repdm(i, a, b) for (ll i = (ll)(a); i > (ll)(b); i--)
  
  int main()
  {
  
    int n;
    cin >> n;
    int v[n];
  
    rep(i, n) cin >> v[i];
  
    int seq0[100001] = {}, seq1[100001] = {};
    for (int i = 0; i < n; i += 2)
      ++seq0[v[i]];
    for (int i = 1; i < n; i += 2)
      ++seq1[v[i]];
  
    sort(seq0 + 1, seq0 + 100001, greater<int>());
    sort(seq1 + 1, seq1 + 100001, greater<int>());
  
    if (seq0[0] == seq1[0])
      cout << min(n - seq0[0][0] - seq1[0][1], n - seq[0][1] - seq1[0][0]);
    else
      cout << n - seq0[0][0] - seq1[0][0];
  }
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 /\\/\\/\\/."}]