class Solution:
def Numberofoperations(self , n ):
# write code here
count = 0
while n > 0:
if n%2 == 0:
n = n//2 # 要整除,代码才通过。如果是n = n/2 的话,通过率就是70%
else:
n -= 3
count += 1
if n < 0:
return -1
else:
return count
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