mithilesh kumar singh

0
1 0
0 1 0
1 0 1 0
0 1 0 1 0

class Program

{
static void Main(string[] args)

{
int i, j;

for (i = 1; i <= 5; i++)

{
for (j = 1; j <= i; j++)

{ if ((i + j) % 2 == 0)

{ Console.Write("0");


}
else

{
Console.Write("1");


}

}  Console.WriteLine();

}
Console.ReadLine();

}

}