Buggy python submission (verdict: Runtime Error):
import sys
n = int(input())
a = list(map(int, input().split()))
x1, x2 = [], []
y1, y2 = [], []
for i in range(n//2):
  if not a[2*i] in x1:
    x1.append(a[2*i])
    y1.append(1)
  else:
    y1[x1.index(a[2*i])] += 1

for i in range(n//2):
  if not a[2*i+1] in x2:
    x2.append(a[2*i+1])
    y2.append(1)
  else:
    y2[x2.index(a[2*i+1])] += 1

if len(x1)==1 and len(x2)==1 and x1[0]!=x2[0]:
  print(0)
  sys.exit()

total = 0
if x1[y1.index(max(y1))]!=x2[y2.index(max(y2))]:
  total = sum(y1)-max(y1) + sum(y2) - max(y2)
elif len(x1)==1 and len(x2)==1:
  total = sum(y1)
elif len(x1)==1:
  y3 = y2.pop(x2.index(x1[0]))
  total = sum(y1)-max(y1) + sum(y2) - max(y3)
elif len(x2)==1:
  y3 = y1.pop(x1.index(x2[0]))
  total = sum(y1)-max(y3) + sum(y2) - max(y2)
else:
  y3 = y1.remove(max(y1))
  y4 = y2.remove(max(y2))
  if max(y3) >= max(y4):
    total = sum(y1) - max(y3) + sum(y2) - max(y2)
  else:
    total = sum(y1) - max(y1) + sum(y2) - max(y4)
print(total)

Fixed submission:
from collections import Counter
 
def f(n,v):
	a=Counter(v[0::2]).most_common()
	b=Counter(v[1::2]).most_common()
	
	a.append([0,0])
	b.append([0,0])
	if a[0][0]!=b[0][0]:
		return n-(a[0][1]+b[0][1])
	else:
		return min(n-(a[1][1]+b[0][1]),n-(a[0][1]+b[1][1]))
 
if __name__=="__main__":
	x=int(input())
	data=[int(i) for i in input().split()]
	print(f(x,data))

Buggy python submission (verdict: Runtime Error):
import sys
n = int(input())
a = list(map(int, input().split()))
x1, x2 = [], []
y1, y2 = [], []
for i in range(n//2):
  if not a[2*i] in x1:
    x1.append(a[2*i])
    y1.append(1)
  else:
    y1[x1.index(a[2*i])] += 1

for i in range(n//2):
  if not a[2*i+1] in x2:
    x2.append(a[2*i+1])
    y2.append(1)
  else:
    y2[x2.index(a[2*i+1])] += 1

if len(x1)==1 and len(x2)==1 and x1[0]!=x2[0]:
  print(0)
  sys.exit()

total = 0
if x1[y1.index(max(y1))]!=x2[y2.index(max(y2))]:
  total = sum(y1)-max(y1) + sum(y2) - max(y2)
elif len(x1)==1:
  y3 = y2.remove(x2.index(x1[0]))
  total = sum(y1)-max(y1) + sum(y2) - max(y3)
elif len(x2)==1:
  y3 = y1.remove(x1.index(x2[0]))
  total = sum(y1)-max(y3) + sum(y2) - max(y2)
else:
  y3 = y1.remove(max(y1))
  y4 = y2.remove(max(y2))
  if max(y3) >= max(y4):
    total = sum(y1) - max(y3) + sum(y2) - max(y2)
  else:
    total = sum(y1) - max(y1) + sum(y2) - max(y4)
print(total)

Fixed submission:
from collections import Counter
 
def f(n,v):
	a=Counter(v[0::2]).most_common()
	b=Counter(v[1::2]).most_common()
	
	a.append([0,0])
	b.append([0,0])
	if a[0][0]!=b[0][0]:
		return n-(a[0][1]+b[0][1])
	else:
		return min(n-(a[1][1]+b[0][1]),n-(a[0][1]+b[1][1]))
 
if __name__=="__main__":
	x=int(input())
	data=[int(i) for i in input().split()]
	print(f(x,data))

Buggy python submission (verdict: Runtime Error):
import sys
n = int(input())
a = list(map(int, input().split()))
x1, x2 = [], []
y1, y2 = [], []
for i in range(n//2):
  if not a[2*i] in x1:
    x1.append(a[2*i])
    y1.append(1)
  else:
    y1[x1.index(a[2*i])] += 1
  
  if not a[2*i+1] in x2:
    x2.append(a[2*i+1])
    y2.append(1)
  else:
    y2[x2.index(a[2*i+1])] += 1
print(x1,y1,x2,y2)
if len(x1)==1 and len(x2)==1 and x1[0]!=x2[0]:
  print(0)
  sys.exit()

total = 0
if x1[y1.index(max(y1))]!=x2[y2.index(max(y2))]:
  total = sum(y1)-max(y1) + sum(y2) - max(y2)
elif len(x1)==1:
  y3 = y2.remove(x2.index(x1[0]))
  total = sum(y1)-max(y1) + sum(y2) - max(y3)
elif len(x2)==1:
  y3 = y1.remove(x1.index(x2[0]))
  total = sum(y1)-max(y3) + sum(y2) - max(y2)
else:
  y3 = y1.remove(max(y1))
  y4 = y2.remove(max(y2))
  if max(y3) >= max(y4):
    total = sum(y1) - max(y3) + sum(y2) - max(y2)
  else:
    total = sum(y1) - max(y1) + sum(y2) - max(y4)
print(total)

Fixed submission:
from collections import Counter
 
def f(n,v):
	a=Counter(v[0::2]).most_common()
	b=Counter(v[1::2]).most_common()
	
	a.append([0,0])
	b.append([0,0])
	if a[0][0]!=b[0][0]:
		return n-(a[0][1]+b[0][1])
	else:
		return min(n-(a[1][1]+b[0][1]),n-(a[0][1]+b[1][1]))
 
if __name__=="__main__":
	x=int(input())
	data=[int(i) for i in input().split()]
	print(f(x,data))