【问题描述】

蛇形矩阵是由1开始的自然数依次排列成的一个矩阵上三角形。



【要求】

【数据输入】本题有多组数据，每组数据由一个正整数N组成。（N不大于100）



【数据输出】对于每一组数据，输出一个N行的蛇形矩阵。两组输出之间不要额外的空行。矩阵三角中同一行的数字用一个空格分开。行尾不要多余的空格。

-Descr iption serpentine matrix is ​ ​ started by a natural number in turn arranged in a matrix on the triangle. [Requirements] [data entry] of this title more than one set of data, each data by a positive integer N. (N is not greater than 100) [Data output for each set of data, the output of an N-row serpentine matrix. Not extra blank line between the two sets of output. Matrix on the same line of the triangle in the figures are separated by one space. End of line, not the extra space.