题解 | #蛇形矩阵#

N = int(input())
num = 1
dp = [[] for i in range(N)]
for i in range(N):
    for j in range(i+1):
        dp[i].append(num)
        num += 1

for i in range(N):
    for j in dp:
        if j:
            print(j.pop(),end=' ')
    print()