N digit numbers
Level: Beginner (score: 2)
Write a function that accepts a list of numbers and converts them into n digit integers.
Examples:
n_digit_numbers([1, 2, 3], 2) => [10, 20, 30]
n_digit_numbers([8, 9, 10], 2) => [80, 90, 10]
n_digit_numbers([-1.1, 2.22, -3.333], 3) => [-110, 222, -333]
Note: Negative numbers should keep their negativity and calling the function with n < 1 should raise a ValueError.