Algorithm Analysis

Using a loop, we find the smallest element of the array $min$. We output its doubled value.

Algorithm Implementation

We read the input data. We look for the minimum element of the array $min$.

scanf("%d", &n);
min = 100;
for (i = 0; i < n; i++)
{
    scanf("%lf", &a);
    if (a < min) min = a;
}

We output the answer – the doubled minimum element.

printf("%.2lf\n", 2 * min);