LeetCode2DArrayToCSharpArray.cs

public List<List<int>> ListFromString(string str)
{
    return str.Split(']')
                .Where(x => x.Length > 0)
                .Select(x=> x
                            .Split(new char[] { '[', ',' })
                            .Where(m => m.Length > 0)
                            .Select(m => Convert.ToInt32(m))
                            .ToList())
                .ToList();
}

Making public