deftriangles():
L=[1]
whileTrue:
yield L
a=L+[0]
L=[a[x]+a[x-1] for x inrange(len(a))]
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水滴竹沙
deftriangles():
L=[1]
whileTrue:
yield L
a=L+[0]
L=[a[x]+a[x-1] for x inrange(len(a))]