在下面的代码中,我得到了我设置的递归函数的最佳值。
现在我想得到帮助构建它的值——我的意思是,知道在每个步骤中使用了哪个选项(或者“搭便车”(这是我的决定)),并以字符串/数组/某种方式返回。你知道吗
故事:我有6个游戏,在每一步中我需要选择是继续游戏,还是切换。每次乘坐都有一个有趣的费率,每次我去它,我想最大限度地发挥乐趣。现在我有最佳的价值,但不是我的骑乘,我去,使我到它
函数F是这里的重点。你知道吗
import math
import numpy as np
#fun rate for each ride,per loop
def funPerRide(rideNum,loopsNum):
if rideNum==1:
return 0
if rideNum==2:
return 100-np.power((4*loopsNum-10),2)
if rideNum==3:
return 50-(1000*np.power(np.e,(-loopsNum/2))/(5*loopsNum+20))
if rideNum==4:
return 4*loopsNum
if rideNum==5:
return 2.5*np.power(loopsNum,2)
if rideNum==6:
return 50*np.power(np.e,(-2*loopsNum+4))
def F(totalTime,timeLeft,rideNum,loopOnCurrRide):
#time of line+operation of ride
totalTimePerRide={1:0,2:40,3:15,4:20,5:23,6:11}
#time of operation of rides
operationTimePerRide={1:0,2:4,3:5,4:8,5:3,6:6}
#unfeasable conditions:
if timeLeft<0:
return -np.inf
if timeLeft+loopOnCurrRide*operationTimePerRide[rideNum]>totalTime:
return -np.inf
if loopOnCurrRide>3:
return -np.inf
#edge condition
if timeLeft == 0:
return 0
#fun if i stay on the ride im on right now
staying = funPerRide(rideNum,loopOnCurrRide+1)-funPerRide(rideNum,loopOnCurrRide)+F(totalTime,timeLeft-operationTimePerRide[rideNum],rideNum,loopOnCurrRide+1)
#calculating fun if i switch to the maximum-fun-ride, that is not the ride im currently at
switching = -1
whichRide=-1
for i in range(1,7):
if i>rideNum:
switchOption = funPerRide(i,loopOnCurrRide)+F(totalTime,timeLeft-4.5-totalTimePerRide[i],i,1)
if switchOption>switching:
switching, whichRide=switchOption,i
#calculating maximum fun between switching and staying
maxval,maxride=max((staying,rideNum),(switching,whichRide))
path.append(maxride)
maxval=float(maxval)
return float(maxval)
path = []
print(F(120,120,1,0),path)
函数F可以返回两个值:第一个最优答案,第二个最优路径作为索引列表。你知道吗
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