VB.net如何将一个一维数组根据排列组合转化为二维数组

Question

假设数组arr1(x)={1,2,3,2}

如何由数组arr1得到一个二维数组arr2

arr2(y,x)

{

0,0,0,0

0,0,0,1

0,0,0,2

0,0,1,0

0,0,1,1

0,0,1,2

0,0,2,0

.....

}

即二维数组每一行的值为一维数组每个值从0开始的排列组合，一维数组长度不一定是4，可能会更长。

Answer 1

Module Module1

	Sub Main()
		Dim arr1() As Integer = {1,3,1,2}
		Dim snm, v, i, j, t As Integer
		snm = 1
		For Each v in arr1
			snm = snm * (v+1)
		Next
		Dim arr2(snm-1,arr1.Length-1) As Integer
		For i = 0 To snm-1
			t = 1
			For j = arr1.Length-1 To 0 step -1
				arr2(i,j) = (i\t) MOD (arr1(j)+1)
				t = t * (arr1(j)+1)
		 	Next
		Next

		For i = 0 To snm-1
			For j = 0 To arr1.Length-1
				Console.Write(arr2(i,j)&" ")
		 	Next
			Console.WriteLine()
		Next
	End Sub

End Module