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我需要计算从n到0的道路数量,但我的代码似乎适用于某些情况,有些则不适用。Python中的道路计算(递归)
编辑: 当我尝试执行:道路(7,2,3) 它表明:
线95是在末端
Traceback (most recent call last):
File "python", line 102, in <module>
File "python", line 95, in roads
File "python", line 95, in roads
File "python", line 95, in roads
TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'
def jumps(n, j):
if n == 0:
return True
elif n<0:
return False
else:
if n<j:
return False
elif n==j:
return True
elif n>j:
if n%j ==0:
return True
else:
return False
def roads(n, short_jump, long_jump, memo=None):
if memo == None:
memo = {}
if n not in memo:
if n==0:
memo[n] = 1
return memo[n]
elif n<0:
memo[n] = 0
return memo[n]
else:
sum_hmrm = 0
a = jumps(n, short_jump)
b = jumps(n, long_jump)
c = n-long_jump
d = n-short_jump
if a == True:
sum_hmrm += 1
if b == True:
sum_hmrm += 1
sum_hmrm += (roads(c, short_jump, long_jump, memo) + roads(d, short_jump, long_jump, memo))
memo[n] = sum_hmrm
return memo[n]
_Which_是为它做的病例和没有按不工作? – senshin
道路(2,2,3)工程 道路(7,2,3)不工作 我认为我的问题发生在(n> long_jump)时,但我无法弄清楚为什么 – boku666
你是什么意思“不工作”?它会永远运行吗?引发异常?回答错误的答案(以及你如何知道正确答案)? – Blckknght