Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
v = list(input().split())
from collections import Counter
x, y = list(Counter(v[::2]).items()), list(Counter(v[1::2]).items())
x.sort(key=lambda i:i[1], reverse=True)
y.sort(key=lambda i:i[1], reverse=True)
r = []
for a, b in x[:max(len(x), 3)]:
    for aa, bb in y[:max(len(y), 3)]:
        if a == aa:
            r.append(n-max(b, bb))
        else:
            r.append(n-b-bb)
print(min(r))

Fixed submission:
import collections
n = int(input())
v = list(map(int, input().split(' ')))
a = v[::2]
b = v[1::2]

a_count = []
b_count = []

a_count = collections.Counter(a).most_common(3)
b_count = collections.Counter(b).most_common(3)

if a_count[0][0] != b_count[0][0]:
    print(n-int(a_count[0][1])-int(b_count[0][1]))
else:
    if len(a_count)!= 1 and len(b_count)!= 1:
        print(min(n-int(a_count[0][1])-int(b_count[1][1]),n-int(a_count[1][1])-b_count[0][1]))
    elif len(a_count) == 1 and len(b_count)!=1:
        print(n-int(a_count[0][1])-int(b_count[1][1]))
    elif len(b_count)==1 and len(a_count)!= 1:
        print(n-int(a_count[1][1])-int(b_ocunt[0][1]))
    else:
        print(int(n/2))

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
v = list(input().split())
from collections import Counter
x, y = list(Counter(v[::2]).items()), list(Counter(v[1::2]).items())

r = []
for a, b in x:
    for aa, bb in y:
        if a == aa:
            r.append(n-max(b, bb))
        else:
            r.append(n-b-bb)
print(min(r))

Fixed submission:
import collections
n = int(input())
v = list(map(int, input().split(' ')))
a = v[::2]
b = v[1::2]

a_count = []
b_count = []

a_count = collections.Counter(a).most_common(3)
b_count = collections.Counter(b).most_common(3)

if a_count[0][0] != b_count[0][0]:
    print(n-int(a_count[0][1])-int(b_count[0][1]))
else:
    if len(a_count)!= 1 and len(b_count)!= 1:
        print(min(n-int(a_count[0][1])-int(b_count[1][1]),n-int(a_count[1][1])-b_count[0][1]))
    elif len(a_count) == 1 and len(b_count)!=1:
        print(n-int(a_count[0][1])-int(b_count[1][1]))
    elif len(b_count)==1 and len(a_count)!= 1:
        print(n-int(a_count[1][1])-int(b_ocunt[0][1]))
    else:
        print(int(n/2))

Buggy python submission (verdict: Time Limit Exceeded):
# 2125
n = int(input())
get_inf = list(map(int, input().split(' ')))
a = get_inf[::2]
b = get_inf[1::2]

def count_unique(lis):
    r = []
    s = []
    i = 0
    while i < len(lis):
        count = 1
        k = i + 1
        if lis[i] > 0:
            while k < len(lis):
                if lis[i] == lis[k] and lis[k] > 0:
                    count += 1
                    lis[k] *= -1
                k += 1
            r.append(count)
            s.append(lis[i])
            lis[i] *= -1
            i += 1
        else:
            i += 1
    return r, s

x = []
x_1 = []
y = []
y_1= []
x, x_1 = count_unique(a)
y, y_1 = count_unique(b)
x.append(0)
y.append(0)

if x_1[x.index(max(x))] != y_1[y.index(max(y))]:
    print(n-max(x)-max(y))
else:
    p = max(x)
    q = max(y)
    x[x.index(max(x))] *= -1
    y[y.index(max(y))] *= -1
    print(min([n-p-max(y), n-q-max(x)]))

Fixed submission:
import collections
n = int(input())
v = list(map(int, input().split(' ')))
a = v[::2]
b = v[1::2]

a_count = []
b_count = []

a_count = collections.Counter(a).most_common(3)
b_count = collections.Counter(b).most_common(3)

if a_count[0][0] != b_count[0][0]:
    print(n-int(a_count[0][1])-int(b_count[0][1]))
else:
    if len(a_count)!= 1 and len(b_count)!= 1:
        print(min(n-int(a_count[0][1])-int(b_count[1][1]),n-int(a_count[1][1])-b_count[0][1]))
    elif len(a_count) == 1 and len(b_count)!=1:
        print(n-int(a_count[0][1])-int(b_count[1][1]))
    elif len(b_count)==1 and len(a_count)!= 1:
        print(n-int(a_count[1][1])-int(b_ocunt[0][1]))
    else:
        print(int(n/2))