我的答案

優化處理下，?不要判斷：
for?x?in?range(1,10):
????for?y?in?range(x+1,10):????????
????????print?x*10+y

for x in [ '1','2','3', '4','5','6','7','8','9']:

? ? for y in [ '0','1','2','3', '4','5','6','7','8','9' ]:

? ? ? ? if x<y:

? ? ? ? ? ? print (x+y)

為什么我這樣寫也能過？? print x+y? 輸出的到底是x與y的和還是簡單的拼接？

for x in [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]:
??? for y in [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]:
??????? if x < y:
??????????? print x, y

for x in [ 1,2,3,4,5,6,7,8,9 ]:

? ? for y in [ 1,2,3,4,5,6,7,8,9,0 ]:

? ? ? ? if x<y:

? ? ? ? ? ? ?print(10*x+y)