题解 | #蛇形矩阵#

N = int(input())
num = 1
ls = [[] for i in range(N)]
# 构建正常的二维列表ls,记得填充的是num
for i in range(N):
    for j in range(i+1):
        ls[i].append(num)
        num += 1
# 注意这里
for i in range(N):
    for j in ls:
        if j:
            print(j.pop(),end=' ')
    print()