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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Threading.Tasks; | |
| namespace SumOfDigitsSequence | |
| { | |
| class Program | |
| { | |
| static ulong Sum(List<ulong> nums) | |
| { | |
| ulong result = 0; | |
| foreach (ulong number in nums) | |
| { | |
| string strNumber = number.ToString(); | |
| foreach (char digit in strNumber) | |
| { | |
| switch (digit) | |
| { | |
| case '0': | |
| break; | |
| case '1': | |
| result += 1; | |
| break; | |
| case '2': | |
| result += 2; | |
| break; | |
| case '3': | |
| result += 3; | |
| break; | |
| case '4': | |
| result += 4; | |
| break; | |
| case '5': | |
| result += 5; | |
| break; | |
| case '6': | |
| result += 6; | |
| break; | |
| case '7': | |
| result += 7; | |
| break; | |
| case '8': | |
| result += 8; | |
| break; | |
| case '9': | |
| result += 9; | |
| break; | |
| default: | |
| break; | |
| } | |
| } | |
| } | |
| return result; | |
| } | |
| static void Main(string[] args) | |
| { | |
| List<ulong> numbers = new List<ulong>(); | |
| numbers.Add(1); | |
| numbers.Add(1); | |
| for (int i = 0; i < 250000; i++) | |
| { | |
| for (uint j = 0; j < 4000000000; j++) | |
| { | |
| ulong num = Sum(numbers); | |
| numbers.Add(num); | |
| } | |
| } | |
| ulong total = Sum(numbers); | |
| Console.WriteLine("Total is " + total); | |
| Console.ReadLine(); | |
| } | |
| } | |
| } |
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