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Project Euler Problem 8
//Rextester.Program.Main is the entry point for your code. Don't change it //Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5 using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public class Program { static string digit_string = @" 73167176531330624919225119674426574742355349194934 96983520312774506326239578318016984801869478851843 85861560789112949495459501737958331952853208805511 12540698747158523863050715693290963295227443043557 66896648950445244523161731856403098711121722383113 62229893423380308135336276614282806444486645238749 30358907296290491560440772390713810515859307960866 70172427121883998797908792274921901699720888093776 65727333001053367881220235421809751254540594752243 52584907711670556013604839586446706324415722155397 53697817977846174064955149290862569321978468622482 83972241375657056057490261407972968652414535100474 82166370484403199890008895243450658541227588666881 16427171479924442928230863465674813919123162824586 17866458359124566529476545682848912883142607690042 24219022671055626321111109370544217506941658960408 07198403850962455444362981230987879927244284909188 84580156166097919133875499200524063689912560717606 05886116467109405077541002256983155200055935729725 71636269561882670428252483600823257530420752963450"; public static void Main(string[] args) { digit_string = digit_string.Replace("\r\n", ""); char[] digit_char_array = digit_string.ToCharArray(); int[] digits = Array.ConvertAll(digit_char_array, c => (int)Char.GetNumericValue(c)); long span = 13, last_i, i, j, product, max_product=1, max_product_i=0; last_i = (digits.Length - 1) - (span - 1); for (i=0; i<= last_i; i++) { for (j=i, product=1; j<=i+(span-1); j++) { product *= digits[j]; } if (product > max_product) { max_product = product; max_product_i = i; } } Console.WriteLine("The max is: {0}, starting at position {1}", max_product, max_product_i+1); } } }
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