using System;

using System.Linq;

using System.Collections.Generic;

public static class Program

{

    public static void Main()

    {

        Solution1();

        Console.WriteLine("-----------");

        Solution2();

    }

    private static void Solution1() {

        var people = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,

                29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51

        };

        var groups = 8;

        var remaining = people.Length % groups;

        var pergroup = (people.Length - remaining) / groups;

        var result = new int[groups][];

        var next = 0;

        var passed = 0;

        for (var i = 0; i < groups; i++) {

            next = pergroup + (remaining-- > 0 ? 1 : 0);

            result[i] = people.Skip(passed).Take(next).ToArray();

            passed += next;

​

            Console.WriteLine(string.Join(" ", result[i]));

        }

    }

    private static void Solution2() {

        var people = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,

                29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51

        };

        var groups = 8;

        var result = GroupPeople(people, groups).ToArray();

        for (var i = 0; i < groups; i++) {

            Console.WriteLine(string.Join(" ", result[i]));

        }

    }

    private static IEnumerable<T[]> GroupPeople<T>(T[] people, int groups) {

        var passed = 0;

        for (var i = 0; i < groups; i++) {

            var pergroup = people.Length / groups + (i < people.Length % groups ? 1 : 0);

            yield return people.Skip(passed).Take(pergroup).ToArray();

            passed += pergroup;

        }

    }

}

​

​