题解 | #蛇形矩阵#

N=int(input())

ls=[]

n=0#共n个数字

for i in range(1,N+1):

    n+=i

for i in range(1,N+1):

    a=[]

    for j in range(i*(i-1)//2+1,i*(i-1)//2+1+i):

        a.append(j)

    ls.append(a)  

ls_2=[]

for i in range(1,N+1):

    b=[]

    for item in ls:

        if len(item)>=i:

            b.append(item[-i])

    ls_2.append(b)

for item in ls_2:

    for i in item:

        print(i,end=' ')

    print()