if len(L) == 0:
return (None, None)
max = L[0]
min = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return (min,max)
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用户4031128102
if len(L) == 0:
return (None, None)
max = L[0]
min = L[0]
for x in L:
if x > max:
max = x
if x < min:
min = x
return (min,max)