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 Python (3.4.3) (judge verdict: Wrong Answer)

from collections import Counter
import sys
input = sys.stdin.readline
n = int(input())
vlist = tuple(map(int,input().split()))
even = Counter(vlist[::2]).most_common(2)
odd = Counter(vlist[1::2]).most_common(2)
if even[0][0]==odd[0][0]:
    if len(even)==1 or len(odd)==1:
        if len(even)==1 or len(odd)==1:
            print(even[0][1])
        else:
            if len(even)==1:
                if even[0][1]>odd[0][1]:
                    print(n-even[0][1]-odd[1][1])
                else:
                    print(n+even[0][1]-odd[0][1])
            else:
                if even[0][1]>odd[0][1]:
                    print(n-even[0][1]+odd[0][1])
                else:
                    print(n-even[1][1]-odd[0][1])
    else:
        if even[0][1]>odd[0][1]:
            print(n-even[0][1]-odd[1][1])
        else:
            print(n-even[1][1]-odd[0][1])            
else:
    print(n-odd[0][1]-even[0][1])