Envío 594

Código

import math

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

assert len(numbers) == n

right_side_sum = [0]
left_side_sum = [0]
for i in range(1, n):
    previous_left = left_side_sum[i-1]
    previous_right = right_side_sum[0]
    left_side_sum.append(previous_left + numbers[i - 1])
    right_side_sum.insert(0, previous_right + numbers[n - i])

split_number = -1
for i in range(1, n):
    if right_side_sum[i - 1] < 0 and left_side_sum[i] > 0:
        split_number = i
        break

    if right_side_sum[n - (i + 1)] < 0 and left_side_sum[n - i] > 0:
        split_number = n - i

if split_number == -1:
    print("Impossible")
else:
    print(split_number)