""""
可能我想错了，没有多余时间了，
我把这道题想成了字符串z字变换的题型了

"""
def square(n,m):
	lst = [[0 for i in range(m)] for _ in range(n)]
	cols = 0
	rows = 0
	targe = True
	count = 0
	ll = n * m
	for i in range(1,ll+1):
		if cols==n and (rows+1)%2==1:
			cols -= 1
		elif cols == 0 and (rows+1)%2==0:
			cols += 1
		if 0<=cols <= n - 1 and rows <= m-1:
			if count == n:
				rows += 1
				if targe:
					targe = False
				else:
					targe = True
				count = 0
			if targe:
				lst[cols][rows] = i
				cols += 1
			else:
				lst[cols][rows] = i
				cols -= 1
			count += 1
	print(lst)






if __name__ == '__main__':
    square(3,5)