static long TapeEquilibrium(int[] a)
{
    long firstPart = 0;
    long secondPart = a.Sum(x => (long)x);
    long min = long.MaxValue;

    for (int i = 0; i < a.Length - 1; i++)
    {
        firstPart += i;
        secondPart -= i;
        var difference = Math.Abs(firstPart - secondPart);
        min = difference < min ? difference : min;
    }

    return min;
}

static int Triangle(int[] a)
{
    var sorted = (int[])a.Clone();
    Array.Sort(sorted);
    var c = sorted.Length;
    if (c < 3)
    {
        return 0;
    }

    for (int i = 0; i < c - 2; i++)
    {
        if (sorted[i] > 0 && sorted[i] > (long)sorted[i + 2] - sorted[i + 1])
        {
            return 1;
        }
    }

    return 0;
}