Buggy python submission (verdict: Runtime Error):
from collections import Counter

N = int(input())
A = list(map(int, input().split()))
c_dict = Counter(A)
B = []
C = []

for k, v in c_dict.items():
    if v >= 4:
        B.append(k)
    elif v >= 2:
        C.append(k)
B.sort(reverse=True)
C.sort(reverse=True)
print(B[0])
print(C[0])

if len(B) < 1 and len(C) < 2:
    print(0)
elif len(B) < 1 and len(C) >= 2:
    print((C[0]*C[1]))
elif len(B) >= 1 and len(C) == 1:
    print(max(B[0] ** 2), (B[0] * C[0]))
elif len(B) >= 1 and len(C) >= 2:
    C = (B[0] ** 2)
    D = (B[0] * C[0])
    E = (C[0] * C[1])
    print(max(C, D, E))


Fixed submission:
from collections import Counter

N = int(input())
A = list(map(int, input().split()))
c_dict = Counter(A)
B = []
C = []

for k, v in c_dict.items():
    if v >= 4:
        B.append(k)
    elif v >= 2:
        C.append(k)
B.sort(reverse=True)
C.sort(reverse=True)

if len(B) < 1 and len(C) < 2:
    print(0)
elif len(B) < 1 and len(C) >= 2:
    F = C[1] * C[0]
    print(F)
elif len(B) >= 1 and len(C) == 1:
    D = B[0] ** 2
    E = C[0] * B[0]
    print(max(D, E))
elif len(B) >= 1 and len(C) >= 2:
    D = B[0] ** 2
    E = C[0] * B[0]
    F = C[1] * C[0]
    print(max(D, E, F))

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
A = list(map(int, input().split()))
A.sort()
A.reverse()
que = []

def solve(i):
    if len(que) >=  2:
        return True
    num = A[i]
    check = num in que
    if A.count(num) > 3:
        que.append(num)
        que.append(num)
    elif A.count(num) > 1 and check == False:
        que.append(num)
    if i == N - 1:
        return False
    else:
        return solve(i+1)

a = solve(0)
if a == True:
    ans = que[0] * que[1]
    print(ans)
else:
    print(0)


Fixed submission:
from collections import Counter

N = int(input())
A = list(map(int, input().split()))
c_dict = Counter(A)
B = []
C = []

for k, v in c_dict.items():
    if v >= 4:
        B.append(k)
    elif v >= 2:
        C.append(k)
B.sort(reverse=True)
C.sort(reverse=True)

if len(B) < 1 and len(C) < 2:
    print(0)
elif len(B) < 1 and len(C) >= 2:
    F = C[1] * C[0]
    print(F)
elif len(B) >= 1 and len(C) == 1:
    D = B[0] ** 2
    E = C[0] * B[0]
    print(max(D, E))
elif len(B) >= 1 and len(C) >= 2:
    D = B[0] ** 2
    E = C[0] * B[0]
    F = C[1] * C[0]
    print(max(D, E, F))

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))
A.sort()
A.reverse()
que = []

def solve(i):
    if len(que) == 2:
        return True
    num = A[i]
    check = num in que
    if A.count(num) > 1 and check == False:
        que.append(num)
    if i == N - 1:
        return False
    else:
        return solve(i+1)

a = solve(0)
if a == True:
    ans = que[0] * que[1]
    print(ans)
else:
    print(0)


Fixed submission:
from collections import Counter

N = int(input())
A = list(map(int, input().split()))
c_dict = Counter(A)
B = []
C = []

for k, v in c_dict.items():
    if v >= 4:
        B.append(k)
    elif v >= 2:
        C.append(k)
B.sort(reverse=True)
C.sort(reverse=True)

if len(B) < 1 and len(C) < 2:
    print(0)
elif len(B) < 1 and len(C) >= 2:
    F = C[1] * C[0]
    print(F)
elif len(B) >= 1 and len(C) == 1:
    D = B[0] ** 2
    E = C[0] * B[0]
    print(max(D, E))
elif len(B) >= 1 and len(C) >= 2:
    D = B[0] ** 2
    E = C[0] * B[0]
    F = C[1] * C[0]
    print(max(D, E, F))