static void Math7()
{
int[][] arr = new int[4][];
for (int i = 0; i < arr.Length; i++)
{
arr[i] = new int[i + 1];
for (int j = 0; j < arr[i].Length; j++)
{
arr[i][j] = j + 1;
Console.Write(arr[i][j] + " ");
}
Console.Write("\n");
}
}
//{{'a'},{'b','b'},{'c','c','c'}}
static void Math9()
{
char[][] arr = new Char[3][];
char a = 'a';
for (int i = 0; i < arr.Length; i++)
{
arr[i] = new Char[i + 1];
for (int j = 0; j < arr[i].Length; j++)
{
arr[i][j] = a;
Console.Write(arr[i][j] + " ");
}
a = (char)(a + 1);
//a++;
Console.Write("\n");
}
}
//{{1},{2,2},{3,3,3},{4,4,4,4}}
static void Math8()
{
int[][] arr = new int[4][];
for (int i = 0; i < arr.Length; i++)
{
arr[i] = new int[i + 1];
for (int j = 0; j < arr[i].Length; j++)
{
arr[i][j] = i + 1;
Console.Write(arr[i][j] + " ");
}
Console.Write("\n");
}
}