jagged_array_3.cs

using System;

class Program
{
    static void Main(string[] args)
    {
        int a = -5;
        int[][] nums = new int[3][];

        nums[0] = new int[5];
        nums[1] = new int[2];
        nums[2] = new int[3];
            
        for(int i=0; i<nums.Length; i++){
            for(int j=0; j<nums[i].Length; j++){

                if (i % 2 == 0)
                    a += 5;
                else
                    a -= 5;

                nums[i][j] = a;
                Console.Write(nums[i][j] + " ");
            }
            Console.WriteLine();
        }

        Console.ReadKey();
    }
}