题解 | #蛇形矩阵#

import sys

def run(a):
    b = [[] for _ in range(a)]
    c = list(range(1, sum(list(range(1,a+1)))+1))
    for i in range(1, a+1):
        d, c = c[:i], c[i:]
        for j in range(len(d)):
            b[len(d)-j-1].append(str(d[j]))
    b = [" ".join(_) for _ in b]
    b = "\n".join(b)
    return b

for line in sys.stdin:
    _a = line.strip()
    print(run(int(_a)))