Ndtyjky

This is from a series of computer science exercises I'm working through for which I'm stuck on the following compiler error when trying to split a list of integers into sublists. I've tried many variations of initializing the list of integer arrays but can't seem to find a configuration that works in the documentation or on stack overflow.

    char array = digits.ToCharArray();



    var intArray = new List<int>(new int[span]);



    for (int i = 0; i < span; i++) 

    {

       intArray[i] =  (int)Char.GetNumericValue(array.ElementAt(i));

    }



    var data = new List<int>();

    int n = 0;

    while (data[n].Length == span)

    {

       data[n] = intArray.Skip(n).Take(span).ToArray();

       n++;

    }

Output:

Parameter name: index

   at System.Collections.Generic.List`1.get_Item(Int32 index)

   at LargestSeriesProduct.GetLargestProduct(String digits, Int32 span) in /Users/.../LargestSeriesProduct.cs:line 20

   at seriesTest.Main() in /Users/.../LargestSeriesProduct.cs:line 53

Line 20 comes up in my IDE as while (data[n].Length == span).

Updated

I thought it might be a helpful exercise to write the code in Mathematica first to get more insight into the list of list problems I'm having in C#. It certainly was enlightening (the partition function is super helpful in this situation) but I still don't have a solution for my initial problem.

largestSeriesProduct[string_, int_Integer] := Module[{numbers,lists},

   numbers = ToExpression /@ Characters @ string;

   lists = Times @@@ Partition[numbers,int,1];

   Max @ lists

]

Which for example returns:

largestSeriesProduct["73167176531330624919225119674426574742355349194934",6]



23520

to help you out:

var intArray = new List<int>(new int[span]);



            for (int i = 0; i < span; i++)

            {

                intArray.Add((int)Char.GetNumericValue(array.ElementAt(i)));

            }

My solution.

        var intArray = new List<int>(new int[array.Length]);

        for (int i = 0; i < array.Length; i++) 

        {

            intArray[i] = (int)Char.GetNumericValue(array.ElementAt(i));

        }

        var data = new List<int>();

        int n = 0;

        while (intArray.Skip(n).Take(span).ToArray().Length == span)

        {

            data.Add(intArray.Skip(n).Take(span).ToArray());

            n++;   

        }

        var list = new List<long>(data.Count());

        foreach (int nums in data)

        {

            list.Add((long)nums.Aggregate((total, next) => total * next));

        }

        long maxProduct = list.Max();

        return maxProduct;