sham, subMatrix

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class submatrix
    {
        private int row;
        private int col;
        private int[,] mat;//= new int[ row, col];
        public submatrix(int row, int col)
        {
            this.row = row;
            this.col = col;
            this.mat = new int[row, col];
        }

        public void Build(int a)
        {

            Random rnd = new Random();
            for (int c = 0; c < col; c++)
                for (int r = 0; r < row; r++)
                    mat[r, c] = rnd.Next(-a, a + 1);

        }

        public bool issubmatrix()
        {
            int k = 0;
            for (int r = 0; r < row; r++)
                for (int c = 0; c < col; c++)
                    if (mat[r, c] != 0)
                        k++;




            if (k < (row * col) / 2)
                return true;
            else
                return false;

        }

        public void print()
        {
            for (int r = 0; r < row; r++)
            {
                for (int c = 0; c < col; c++)
                {

                    Console.Write("{0,5}", mat[r, c]);

                }

                Console.WriteLine();
            }
        }
    }
}