Buggy python submission (verdict: Runtime Error):
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=True)

    v = []
    while len(A) != 0:
        if len(v) == 2:
            break

        if A[0] == A[1]:
            v.append(A[0])
            A.pop(0)
            A.pop(0)
        else:
            A.pop(0)

    if len(v) == 1 or len(v) == 0:
        print(0)
    else:
        print(v[0] * v[1])


Fixed submission:
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=True)

    v = []
    while len(A) > 1:
        if len(v) == 2:
            break

        if A[0] == A[1]:
            v.append(A[0])
            A.pop(0)
            A.pop(0)
        else:
            A.pop(0)

    if len(v) == 1 or len(v) == 0:
        print(0)
    else:
        print(v[0] * v[1])

Buggy python submission (verdict: Time Limit Exceeded):
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    tmp_max_square = 0
    tmp_max_dup_1 = 0
    tmp_max_dup_2 = 0
    while len(A) != 0:
        tmp = A[0]
        tmp_count = A.count(tmp)
        # print(tmp_count)
        if tmp_count >= 4:
            if tmp_max_square < tmp:
                tmp_max_square = tmp

            if tmp_max_dup_2 < tmp < tmp_max_dup_1:
                tmp_max_dup_2 = tmp
            elif tmp_max_dup_1 <= tmp:
                tmp_max_dup_2 = tmp_max_dup_1
                tmp_max_dup_1 = tmp
        elif tmp_count >= 2:
            if tmp_max_dup_2 < tmp < tmp_max_dup_1:
                tmp_max_dup_2 = tmp
            elif tmp_max_dup_1 <= tmp:
                tmp_max_dup_2 = tmp_max_dup_1
                tmp_max_dup_1 = tmp

        for i in range(tmp_count):
            A.remove(tmp)

    square_ans = tmp_max_square * tmp_max_square
    rectan_ans = tmp_max_dup_1 * tmp_max_dup_2
    if square_ans < rectan_ans:
        print(rectan_ans)
    else:
        print(square_ans)


Fixed submission:
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=True)

    v = []
    while len(A) > 1:
        if len(v) == 2:
            break

        if A[0] == A[1]:
            v.append(A[0])
            A.pop(0)
            A.pop(0)
        else:
            A.pop(0)

    if len(v) == 1 or len(v) == 0:
        print(0)
    else:
        print(v[0] * v[1])

Buggy python submission (verdict: Time Limit Exceeded):
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    t = set()
    no_dup = list(set([x for x in A if x in t or t.add(x)]))
    square_list = []
    for i in no_dup:
        if 4 <= A.count(i):
            square_list.append(i)

    no_dup.sort(reverse=True)
    if len(no_dup) == 0:
        print(0)
    else:
        if len(square_list) == 0:
            square_area = 0
        else:
            square_max = max(square_list)
            square_area = square_max * square_max
            
        if len(no_dup) == 1:
            rectan_area = 0
        else:
            rectan_area = no_dup[0] * no_dup[1]
            
        if square_area < rectan_area:
            print(rectan_area)
        else:
            print(square_area)


Fixed submission:
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=True)

    v = []
    while len(A) > 1:
        if len(v) == 2:
            break

        if A[0] == A[1]:
            v.append(A[0])
            A.pop(0)
            A.pop(0)
        else:
            A.pop(0)

    if len(v) == 1 or len(v) == 0:
        print(0)
    else:
        print(v[0] * v[1])

Buggy python submission (verdict: Time Limit Exceeded):
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    t = set()
    dup = [x for x in A if x in t or t.add(x)]
    no_dup = list(set(dup))
    square_list = []
    for i in no_dup:
        if 3 <= dup.count(i):
            square_list.append(i)

    no_dup.sort(reverse=True)
    square_list.sort(reverse=True)
    if len(no_dup) == 0:
        print(0)
    else:
        if len(square_list) == 0:
            square_area = 0
        else:
            square_area = square_list[0] * square_list[0]
        if len(no_dup) == 1:
            rectan_area = 0
        else:
            rectan_area = no_dup[0] * no_dup[1]
        if square_area < rectan_area:
            print(rectan_area)
        else:
            print(square_area)


Fixed submission:
if __name__ == '__main__':
    N = int(input())
    A = list(map(int, input().split()))

    A.sort(reverse=True)

    v = []
    while len(A) > 1:
        if len(v) == 2:
            break

        if A[0] == A[1]:
            v.append(A[0])
            A.pop(0)
            A.pop(0)
        else:
            A.pop(0)

    if len(v) == 1 or len(v) == 0:
        print(0)
    else:
        print(v[0] * v[1])