C# LevenshteinDistance algorithm for spellchecker

问题

Hi i'm using the levenshtein algorithm to calculate the difference between two strings, using the below code. It currently provides the total number of changes which need to be made to get from 'answer' to 'target', but i'd like to split these up into the types of errors being made. So classifying an error as a deletion, substitution or insertion.

I've tried adding a simple count but i'm new at this and don't really understand how the code works so not sure how to go about it.

static class LevenshteinDistance
    {
        /// <summary>
        /// Compute the distance between two strings.
        /// </summary>
        public static int Compute(string s, string t)
        {
            int n = s.Length;
            int m = t.Length;
            int[,] d = new int[n + 1, m + 1];
            // Step 1
            if (n == 0)
            {
                return m;
            }
            if (m == 0)
            {
                return n;
            }
            // Step 2
            for (int i = 0; i <= n; d[i, 0] = i++)
            {
            }
            for (int j = 0; j <= m; d[0, j] = j++)
            { 
            }
            // Step 3
            for (int i = 1; i <= n; i++)
            {

                //Step 4
                for (int j = 1; j <= m; j++)
                {
                    // Step 5
                    int cost = (t[j - 1] == s[i - 1]) ? 0 : 1;
                    // Step 6
                    d[i, j] = Math.Min(
                        Math.Min(d[i - 1, j] + 1, d[i, j - 1] + 1),
                        d[i - 1, j - 1] + cost);
                }
            }
            // Step 7
            return d[n, m];
        }
    }

Thanks in advance.

来源：https://stackoverflow.com/questions/15571419/c-sharp-levenshteindistance-algorithm-for-spellchecker