if L:
min=L[0]
max=L[0]
for v in L:
if v<=min:
min=v
if v>=max:
max=v
return (min,max)
else:
return (None, None)
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信不信我会fly
if L:
min=L[0]
max=L[0]
for v in L:
if v<=min:
min=v
if v>=max:
max=v
return (min,max)
else:
return (None, None)