Problem:
Score : 300 points

Problem 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.

Constraints

2 \leq n \leq 10^5

n is even.

1 \leq v_i \leq 10^5

v_i is an integer.

Input

Input is given from Standard Input in the following format:

n
v_1 v_2 ... v_n

Output

Print the minimum number of elements that needs to be replaced.

Sample Input 1

4
3 1 3 2

Sample Output 1

1

The sequence 3,1,3,2 is not /\/\/\/, but we can make it /\/\/\/ by replacing one of its elements: for example, replace the fourth element to make it 3,1,3,1.

Sample Input 2

6
105 119 105 119 105 119

Sample Output 2

0

The sequence 105,119,105,119,105,119 is /\/\/\/.

Sample Input 3

4
1 1 1 1

Sample Output 3

2

The elements of the sequence 1,1,1,1 are all the same, so it is not /\/\/\/.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main{

     public static void main(String []args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] v=new int[n];
        int t=0;
        for(int i=0;i<n;i++){
            v[i]=sc.nextInt();
        }
        for(int i=0;i<n/2;i++){
            if(i%2==0){
                if(v[i]!=v[i*2]){
                    System.out.println(v[i]);
                    t=1;
                    break;
                }
            }else{
                if(v[i]!=v[i*2+1]){
                    System.out.println(v[i]);
                    t=1;
                    break;
                }
            }
            for(int j=0;j<n;j++){
                if(v[i]==v[j]){
                    t=1;
                    System.out.println(n/2);
                    break;
                }
                
            }
        }
        if(t==0){
            System.out.println(0);
        }
        
     }
}