题解 | #蛇形矩阵#

import sys
for n in sys.stdin.readlines():
    n = int(n)
    li = []
    base = 1
    for l in range(1, n+1):
        li.append([x for x in range(base, base + l)])
        base += l
    while li:
        for l in li:
            if l:
                print(l.pop(), end=' ')
        print()
        li = list(filter(lambda l:l, li))