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用户可以自定义猜的次数，如果在规定的次数内猜出来了，就输出great，
from random import randint
s=randint(0,300)
go=int(input('请输入猜字次数：'))
def foo(t):
i=0
while i in range(t):
digit=int(input('please enter a number between(0,300)'))
if digit==s:
print('great!')
break
elif digit>s:
print('too large ,please try again')
else :
print('too small ,please try again')
i+=1
print('Game over!')
foo(go)
