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project euler 14, C#
//Title of this code //Rextester.Program.Main is the entry point for your code. Don't change it. using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public class Program { static int[] cache = new int[1000000]; public static void Main(string[] args) { int max=0; int res=0; for(int i=1; i<1000000; i++) { int l = GetChainLength(i); if(l>max) { max = l; res = i; } } Console.WriteLine(res); } static int GetChainLength(int number) { if(number == 1) { cache[1]=1; return 1; } long next = number; int count=0; while(next >= number) { if(next%2 == 0) { next = next/2; } else { next = 3*next+1; } count++; } cache[number] = count+cache[next]; return cache[number]; } } }
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