7-2

int.TryParse(Console.ReadLine(), out int n);

Random random = new Random();

int[] a = new int[n];
for (int i = 0; i < n; i++)
{
    a[i] = random.Next(-100, 101);
    Console.Write(a[i]+"\t");
}

Console.WriteLine();

for (int i = 0; i < n; i++)
{
    a[i] = -a[i];
    Console.Write(a[i]+"\t");
}