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| import random
# 服务时间概率相关变量
numbers = [10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60]
probabilities = [1/36, 2/36, 3/36, 4/36, 5/36, 6/36, 5/36, 4/36, 3/36, 2/36, 1/36]
# 依据probabilities输出每次的服务时间
def service_time():
random_number = random.random()
cumulative_probabilities = [sum(probabilities[:i+1]) for i in range(len(probabilities))]
index = next(i for i, p in enumerate(cumulative_probabilities) if p > random_number)
return numbers[index]
# 1/3的概率有电话打来
def sendcar():
random_number = random.random()
if random_number < 1/3:
return True
else:
return False
# 救护车数量和时间长度（分钟）
carsNumber=4
timeLength=24
# listTime为每分钟有多少救护车的列表
listTime=[carsNumber]*timeLength
currentTime = 0 #当前时间
validResponse=0 #有效发车次数
invalidResponse=0 #无效发车次数
# 主函数部分
while currentTime < timeLength:
# 在5t时刻
if(currentTime%5==0):
# 判断是否有电话打来
if sendcar():
# 在时间线上找
for waitTime in range(currentTime+5, timeLength):
if listTime[waitTime]>0 and waitTime-currentTime<10:# 打完电话（currentTime+5）后 等待时间小于5分钟
validResponse+=1
service_time_value = str(service_time())
beginTime = waitTime
finishTime = beginTime + eval(service_time_value)
print(f"有效发车 电话到达时间{currentTime} | 实际发车时间{beginTime} | 服务持续时间{service_time_value} | 服务完成时间{finishTime}", end='\n')
# 根据题目情景，打电话开始时刻5分钟后派遣出可用车辆
for j in range(waitTime , waitTime + eval(service_time_value)):
if j>=timeLength:
break
listTime[j] -= 1
currentTime+=1
break
elif listTime[waitTime]>0 and waitTime-currentTime>=10:# 打完电话（currentTime+5）后 等待时间大于5分钟
invalidResponse+=1
service_time_value = str(service_time())
beginTime = waitTime
finishTime = beginTime + eval(service_time_value)
print(f"无效发车 电话到达时间{currentTime} | 实际发车时间{beginTime} | 服务持续时间{service_time_value} | 服务完成时间{finishTime}", end='\n')
# 根据题目情景，打电话开始时刻5分钟后派遣出可用车辆
for j in range(waitTime , waitTime + eval(service_time_value)):
if j>=timeLength:
break
listTime[j] -= 1
currentTime+=1
break
# 在限定时间内找不到可用车辆
else:
print(f"找不到可用无效发车 电话到达时间{currentTime} ", end='\n')
invalidResponse+=1
currentTime+=1
# 在5t该时刻无电话打来
else:
currentTime+=1
# 不在5t时刻
else:
currentTime += 1
print("有效发车:",validResponse)
print("无效发车:",invalidResponse)
# 有效发车/无效发车+有效发车
rate = validResponse/(validResponse+invalidResponse)
print(f"当救护车辆为{carsNumber}时运行{timeLength}分钟，有效发车率为{rate:.3f}", end='\n')
|
