min=L[0]
max=L[0]
for a in L:
while a<min:
min=a
while a>max:
max=a
return (min,max)
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不晚睡不驼背
min=L[0]
max=L[0]
for a in L:
while a<min:
min=a
while a>max:
max=a
return (min,max)