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robhol/2017-12-02_15-24-53.cs Secret

Last active December 2, 2017 14:26
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2017-12-02_15-24-53.cs
//Core function providing the general solution for the problem
int CalcAll(string ip, Func<int, int> locateOther) =>
Enumerable.Range(0, ip.Length)
.Select(i => (a: ip[i], b: ip[locateOther(i) % ip.Length]))
.Where(t => t.a == t.b)
.Sum(t => t.a - '0');
//Specific solutions
int Calc1(string ip) => CalcAll(ip, i => i + 1);
int Calc2(string ip) => CalcAll(ip, i => i + ip.Length / 2);
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