Envío 595

Código

n = int(input())
numbers = [int(number) for number in input().split()]

assert len(numbers) == n

split_position = -1
i = 1
j = n - 1
while i <= j:
    left_sum = sum(numbers[:i])
    right_sum = sum(numbers[i:])
    if right_sum < 0 and left_sum > 0 and i:
        split_position = i
        break

    left_sum = sum(numbers[:j])
    right_sum = sum(numbers[j:])
    if right_sum < 0 and left_sum > 0:
        split_position = j

    i = i + 1
    j = j - 1

if split_position != -1:
    print(split_position)
else:
    print("Impossible")