Buggy python submission (verdict: Runtime Error):
n = int(input())
v = list(map(int,input().split()))

if max(v)==min(v):
	print(int(n/2))
else:
	dic1 = {}
	dic2 = {}
	
	for i in range(n):
		if i % 2 == 1:
			if str(v[i]) in dic1.keys():
				dic1[str(v[i])] = dic1[str(v[i])] + 1
			else:
				dic1[str(v[i])] = 1
	
		if i % 2 == 0:
			if str(v[i]) in dic2.keys():
				dic2[str(v[i])] = dic2[str(v[i])] + 1
			else:
				dic2[str(v[i])] = 1
	
	max1 = max(dic1, key=dic1.get)
	max2 = max(dic2, key=dic2.get)
	p1 = dic1[max1]
	p2 = dic2[max2]
	if max1 == max2:
		dic1.pop(max1)
		dic2.pop(max2)
		if dic1 == {}:
			p3 = 0
		else:
			max3 = max(dic1, key=dic1.get)
			p3 = dict[max3]
		if dic2 == {}:
			p4 = 0
		else:
			max4 = max(dic2, key=dic2.get)
			p4 = dic4[max4]
		if p1 + p4 > p2 + p3:
			p2 = p4
		else:
			p1 = p3
	
	print(n-p1-p2)

Fixed submission:
n = int(input())
v = list(map(int,input().split()))

if max(v)==min(v):
	print(int(n/2))
else:
	dic1 = {}
	dic2 = {}
	
	for i in range(n):
		if i % 2 == 1:
			if str(v[i]) in dic1.keys():
				dic1[str(v[i])] = dic1[str(v[i])] + 1
			else:
				dic1[str(v[i])] = 1
	
		if i % 2 == 0:
			if str(v[i]) in dic2.keys():
				dic2[str(v[i])] = dic2[str(v[i])] + 1
			else:
				dic2[str(v[i])] = 1
	
	max1 = max(dic1, key=dic1.get)
	max2 = max(dic2, key=dic2.get)
	p1 = dic1[max1]
	p2 = dic2[max2]
	if max1 == max2:
		dic1.pop(max1)
		dic2.pop(max2)
		if dic1 == {}:
			p3 = 0
		else:
			max3 = max(dic1, key=dic1.get)
			p3 = dic1[max3]
		if dic2 == {}:
			p4 = 0
		else:
			max4 = max(dic2, key=dic2.get)
			p4 = dic2[max4]
		if p1 + p4 > p2 + p3:
			p2 = p4
		else:
			p1 = p3
	
	print(n-p1-p2)

Buggy python submission (verdict: Runtime Error):
n = int(input())
v = list(map(int,input().split()))

if max(v)==min(v):
	print(int(n/2))
else:
	dic1 = {}
	dic2 = {}
	
	for i in range(n):
		if i % 2 == 1:
			if str(v[i]) in dic1.keys():
				dic1[str(v[i])] = dic1[str(v[i])] + 1
			else:
				dic1[str(v[i])] = 1
	
		if i % 2 == 0:
			if str(v[i]) in dic2.keys():
				dic2[str(v[i])] = dic2[str(v[i])] + 1
			else:
				dic2[str(v[i])] = 1
	
	max1 = max(dic1, key=dic1.get)
	max2 = max(dic2, key=dic2.get)
	p1 = dic1[max1]
	p2 = dic2[max2]
	if max1 == max2:
		dic1.pop(max1)
		dic2.pop(max2)
		max3 = max(dic1, key=dic1.get)
		max4 = max(dic2, key=dic2.get)
		p3 = dic3[max3]
		p4 = dic4[max4]
		if p1 + p4 > p2 + p3:
			p2 = p4
		else:
			p1 = p3
	
	print(n-p1-p2)

Fixed submission:
n = int(input())
v = list(map(int,input().split()))

if max(v)==min(v):
	print(int(n/2))
else:
	dic1 = {}
	dic2 = {}
	
	for i in range(n):
		if i % 2 == 1:
			if str(v[i]) in dic1.keys():
				dic1[str(v[i])] = dic1[str(v[i])] + 1
			else:
				dic1[str(v[i])] = 1
	
		if i % 2 == 0:
			if str(v[i]) in dic2.keys():
				dic2[str(v[i])] = dic2[str(v[i])] + 1
			else:
				dic2[str(v[i])] = 1
	
	max1 = max(dic1, key=dic1.get)
	max2 = max(dic2, key=dic2.get)
	p1 = dic1[max1]
	p2 = dic2[max2]
	if max1 == max2:
		dic1.pop(max1)
		dic2.pop(max2)
		if dic1 == {}:
			p3 = 0
		else:
			max3 = max(dic1, key=dic1.get)
			p3 = dic1[max3]
		if dic2 == {}:
			p4 = 0
		else:
			max4 = max(dic2, key=dic2.get)
			p4 = dic2[max4]
		if p1 + p4 > p2 + p3:
			p2 = p4
		else:
			p1 = p3
	
	print(n-p1-p2)