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

namespace ConsoleApp1
{
    class Matrix
    {
        private int[,] mat;
        public Matrix(int[,] tmp)
        {
            mat = (int[,])tmp.Clone();
            /*int sizeX,sizeY,i,j;
            sizeX = tmp.GetUpperBound(0) + 1;
            sizeY = tmp.GetUpperBound(1) + 1;
            mat = new int[sizeX, sizeY];
            for (int i = 0; i < sizeX; i++)
                for (int j = 0; j < sizeY; j++)
                    mat[i, j] = tmp[i, j];
                    */
        }
        public Matrix(int n,int m)
        {
            mat = new int[n, m];

        }

        public static Matrix operator *(Matrix m1,Matrix m2)
        {
            if(m1.mat.GetUpperBound(1)!=m2.mat.GetUpperBound(0))
            {
                throw new Exception("size is wrong!!");
            }
            else
            {
                int row = m1.mat.GetUpperBound(0) + 1;
                int col = m1.mat.GetUpperBound(1) + 1;
                int col2 = m2.mat.GetUpperBound(1) + 1;
                int i, j, k, sum = 0;
                int[,] tmp = new int[row, col2];
                for(i=0;i<row;i++)
                {
                    for (j = 0; j < col2; j++)
                    {
                        for (k = 0, sum = 0; k < col; k++)
                            sum += m1.mat[i, k] * m2.mat[k, j];
                        tmp[i, j] = sum;
                    }
                }
                m1 = new Matrix(tmp);

            }
            return m1;
        }
        public void Print()
        {
            int i, j;
            int row = mat.GetUpperBound(0) + 1;
            int col = mat.GetUpperBound(1) + 1;
            for (i = 0; i < row; i++)
            {
                for (j = 0; j < col; j++)
                    Console.Write(mat[i, j].ToString() + " ");
                Console.WriteLine();

            }
        }
    }
}