Project Euler – Problem 8


Discover the largest product of five consecutive digits in the 1000-digit number.

Problem:
Find the greatest product of five consecutive digits in the 1000-digit number.

73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450

My Solution:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Euler
{
    class Problem8 : IProblemBase
    {

        //Find the greatest product of five consecutive digits in the 1000-digit number.

        //73167176531330624919225119674426574742355349194934
        //96983520312774506326239578318016984801869478851843
        //85861560789112949495459501737958331952853208805511
        //12540698747158523863050715693290963295227443043557
        //66896648950445244523161731856403098711121722383113
        //62229893423380308135336276614282806444486645238749
        //30358907296290491560440772390713810515859307960866
        //70172427121883998797908792274921901699720888093776
        //65727333001053367881220235421809751254540594752243
        //52584907711670556013604839586446706324415722155397
        //53697817977846174064955149290862569321978468622482
        //83972241375657056057490261407972968652414535100474
        //82166370484403199890008895243450658541227588666881
        //16427171479924442928230863465674813919123162824586
        //17866458359124566529476545682848912883142607690042
        //24219022671055626321111109370544217506941658960408
        //07198403850962455444362981230987879927244284909188
        //84580156166097919133875499200524063689912560717606
        //05886116467109405077541002256983155200055935729725
        //71636269561882670428252483600823257530420752963450

        public Problem8()
        {
        }

        string s = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";

        public string GetAnswer()
        {
            int result = 0;

            char[] c = s.ToCharArray();

            for (int i = 0; i < c.Length-5;i++ )
            {
                char[] c2= new char[5];

                char[] one = new char[1];
                one[0] = c[i];
                int ione = Int32.Parse(new string(one));

                char[] two = new char[1];
                two[0] = c[i+1];
                int itwo = Int32.Parse(new string(two));

                char[] three = new char[1];
                three[0] = c[i+2];
                int ithree = Int32.Parse(new string(three));

                char[] four = new char[1];
                four[0] = c[i+3];
                int ifour = Int32.Parse(new string(four));

                char[] five = new char[1];
                five[0] = c[i+4];
                int ifive = Int32.Parse(new string(five));

                int tempResult = (ione * itwo * ithree * ifour * ifive);
                if (result < tempResult)
                {
                    result = tempResult;
                }
            }

            return result.ToString(); ;

        }

    }
}
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