using System;

Random r = new Random();

int rows = r.Next(10,13);

int cols = r.Next(10,20);

int[,] matrix = new int[rows,cols];

Console.WriteLine(rows);

Console.WriteLine(cols);

​

// mark upper diagonal

for(var i=0; i<= cols; i++)

{

    markByCol(i,0,cols-i);

}

​

// mark lower diagonal

for(var i=1; i<= rows; i++)

    markByCol(cols+1+i,i,cols-1);

string line = string.Empty;

​

for(int i=0; i< rows; i++)

{

    line = string.Empty;

    for(int j=0; j< cols; j++)

    {

        line+= matrix[i,j]+" | ";

    }

    Console.WriteLine(line);

}

​

int markByRow(int marker,int row, int col){

    if((row > -1  && row < rows) && (col > -1 && col < cols))

    {

    matrix[row,col] = marker;

        return markByRow(marker,row+1,col-1);

    }

    else

        return 0;   

}

​

​

​

​

​

int markByCol(int marker,int row,int col){

//Console.WriteLine("Current Row: "+row+"Current Column: "+col);

    if((row > -1  && row < rows) && (col > -1 && col < cols))

    {

    matrix[row,col] = marker;

        return markByCol(marker,row+1,col-1);

    }

    else

        return 0;   

}