def findMinAndMax(L):
if len(L)==0:
return(None,None)
max=min=L[0]
for i in L:
if i<min:
min=i
elif i>max:
max=i
return(min,max)
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长日将尽
def findMinAndMax(L):
if len(L)==0:
return(None,None)
max=min=L[0]
for i in L:
if i<min:
min=i
elif i>max:
max=i
return(min,max)