How to sum up numbers that are greater than or equal to 17 from two locations inside an array?

by

It’s not overly pretty, but this works:

var values = new [] { 13, 18, 13, 12, 13, 17, 17, 18, 19, 20, 18, 17, 17, 12, 13, 15, 17, 16, 16, 19, 18, 19, 20, 19, 18, 16, 11, 13, 19, 14, 12 };

var extended = new [] { 0 }.Concat(values).Concat(new [] { 0 }).ToArray();

var results =
    Enumerable
        .Range(0, values.Length)
        .Select(x => values.Skip(x).Take(3).ToArray())
        .Where(x => x.Length == 3)
        .Select(x => x[1] >= 17 && (x[0] >= 17 || x[2] >= 17) ? x[1] : 0)
        .Aggregate(new List<List<int>>(), (a, x) =>
        {
            if (x == 0)
                a.Add(new List<int>());
            else
                a.Last().Add(x);
            return a;
        })
        .Where(x => x.Count > 0)
        .Select(x => x.Sum())
        .ToArray();

That gives 143 & 113.

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