矩形数组
int array[,] = new int[3,4];
int array[,] = {{1,2,3,4},{2,3,4,5},{3,4,5,6}};
变长数组
int[][] array = new int[2][];
array[0] = new int[3];
array[1] = new int[4];
int[][] array = {new int[]{1,2,3},new int[] {1},new int[]{1,2}};