public static void Solve()
{
 Task("LinqObj61");
 string[] subjects = { "Алгебра", "Геометрия",
 "Информатика" };
 var culture = new System.Globalization
 .CultureInfo("en-US");
// Ввод и обработка
 var r = File.ReadAllLines(GetString(),
 Encoding.Default)
 .Select(e =>
 {
 string[] s = e.Split(' ');
 return new
 {
 name = s[0] + " " + s[1],
 subj = s[3],
 mark = int.Parse(s[4])
 };
 })
 .GroupBy(e => e.name, (k, ee) => new
 {
 name = k,
 avrs = subjects
 .GroupJoin(ee, s => s, e => e.subj,
 (s1, ee1) => ee1.Select(e1 => e1.mark)
 .DefaultIfEmpty().Average())
 })
 .OrderBy(e => e.name)
 .Select(e => e.name + e.avrs.Aggregate("",
 (a, d) => a + " " + d.ToString("f2",
 culture)));
// Вывод
 File.WriteAllLines(GetString(), r.ToArray(),
 Encoding.Default);
}