队列与双向队列
队列类
1 # python 2 # -*- coding: utf-8 -*- 3 """ 4 __title__ = '' 5 __author__ = 'wlc' 6 __mtime__ = '2017/10/13' 7 """ 8 class pythonQueue: 9 def __init__(self): 10 self.items = [] 11 #isEmpty 12 def isEmpty(self): 13 return self.items == [] 14 #enqueue 15 def enqueue(self, element): 16 self.items.insert(0, element) 17 #dequeue 18 def dequeue(self): 19 return self.items.pop() 20 #queue size 21 def size(self): 22 return len(self.items)
双向队列类
1 # python 2 # -*- coding: utf-8 -*- 3 """ 4 __title__ = '' 5 __author__ = 'wlc' 6 __mtime__ = '2017/10/13' 7 """ 8 class pythonDeque: 9 def __init__(self): 10 self.items = [] 11 #isEmpty 12 def isEmpty(self): 13 return self.items == [] 14 #size 15 def size(self): 16 return len(self.items) 17 #addFront 18 def addFront(self, item): 19 self.items.append(item) 20 #addRear 21 def addRear(self, item): 22 self.items.insert(0, item) 23 #removeFront 24 def removeFront(self): 25 return self.items.pop() 26 #removeRear 27 def removeRear(self): 28 return self.items.pop(0)
使用队列模拟打印机类
1 # python 2 # -*- coding: utf-8 -*- 3 """ 4 __title__ = '' 5 __author__ = 'wlc' 6 __mtime__ = '2017/10/13' 7 """ 8 class pythonPrinter: 9 def __init__(self, ppm): 10 self.pageRate = ppm 11 self.currentTask = None 12 self.timeRemaining = 0 13 #计时器 14 def tick(self): 15 if self.currentTask != None: 16 self.timeRemaining = self.timeRemaining - 1 17 if self.timeRemaining <= 0: 18 self.currentTask = None 19 #是否忙 20 def busy(self): 21 if self.currentTask == None: 22 return False 23 else: 24 return True 25 26 #开始下一个任务 27 def startNextTask(self, task): 28 """ 29 :param task: 此处task是一个pythonPrinterTask对象 30 """ 31 self.currentTask = task 32 self.timeRemaining = task.getPage() * 60 / self.pageRate
打印机任务类
1 # python 2 # -*- coding: utf-8 -*- 3 """ 4 __title__ = '' 5 __author__ = 'wlc' 6 __mtime__ = '2017/10/13' 7 """ 8 import random 9 class pythonPrinterTask: 10 def __init__(self, timeStamp): 11 #当前的时间戳 12 self.timeStamp = timeStamp 13 #假设打印页数在1-20之间 14 self.page = random.randrange(1,21) 15 #得到时间戳 16 def getStamp(self): 17 return self.timeStamp 18 #得到打印页数 19 def getPage(self): 20 return self.page 21 #计算等待时间 22 def waitTime(self, currentTime): 23 return currentTime - self.timeStamp
相关算法实现
1 # python3 2 # -*- coding: utf-8 -*- 3 """ 4 __title__ = '' 5 __author__ = 'wlc' 6 __mtime__ = '2017/10/13' 7 """ 8 from dataStructure.dS import pythonQueue 9 from dataStructure.dS import pythonPrinter 10 from dataStructure.dS import pythonPrinterTask 11 from dataStructure.dS import pythonDeque 12 import random 13 14 def hotPotato(nameList, num): 15 """ 16 :program:烫手山芋问题 约瑟夫环 17 :param nameList: 18 :param num: 19 :return: 最后一个人 20 """ 21 #实例化一个队列 22 queue = pythonQueue.pythonQueue() 23 #将名字依次放入队列 24 for list in nameList: 25 queue.enqueue(list) 26 #直到队列size为1 之前依次执行队列首出队列并且进入队尾 27 while queue.size() > 1: 28 for i in range(num): 29 queue.enqueue(queue.dequeue()) 30 queue.dequeue() 31 return queue.dequeue() 32 ################################################################################## 33 34 def printerTask(numSeconds, pageRate): 35 """ 36 :program:模拟打印机排队过程 37 :param numSeconds: 模拟时间长度单位秒 38 :param pageRate: 打印机每分钟处理页数 39 :return: 队列的平均等待时间 40 """ 41 #实例化打印对象 42 printer = pythonPrinter.pythonPrinter(pageRate) 43 #list 用于保存task 等待时间 44 waitList = [] 45 #实例化一个队列用于保存task队列 46 tasksQueue = pythonQueue.pythonQueue() 47 48 #模拟给定时间段的秒数 49 for currentSecond in range(numSeconds): 50 #随机生成一个任务3600秒内 假设一共有20个任务平均下来大约180秒产生一个新的任务 51 if newTask(): 52 #如果是一个新的任务则将其实例化并且添加到队列中 53 taskNew = pythonPrinterTask.pythonPrinterTask(currentSecond) 54 tasksQueue.enqueue(taskNew) 55 #如果打印机不忙并且打印队列不是空的 就将队列的队首给打印机 并且将该队首的等待时间计算出来放到waitList列表中 56 if (not printer.busy()) and (not tasksQueue.isEmpty()): 57 #取出队首 58 taskQueue = tasksQueue.dequeue() 59 #将等待时间放到list里边保存 60 waitList.append(taskQueue.waitTime(currentSecond)) 61 #打印机开始下一个任务 62 printer.startNextTask(taskQueue) 63 #打印机开始一张一张的减去 64 printer.tick() 65 average = sum(waitList) / len(waitList) 66 print("平均等待时间%6.2f %3d 任务正在等待" %(average, int(tasksQueue.size()))) 67 68 def newTask(): 69 """ 70 #program:随机产生1-180的数字 用于模拟在180秒内平均会有一次打印任务 71 :return: True False 72 """ 73 var = random.randrange(1, 181) 74 if var == 180: 75 return True 76 else: 77 return False 78 79 ################################################################################## 80 def palChecker(str): 81 """ 82 program:回文检测 boob 83 :param str: 输入字符串 84 :return: true false 85 """ 86 #实例化一个双向队列 87 palDeque = pythonDeque.pythonDeque() 88 #str 的每一个字符从尾部（index为0的位置）依次保存到双向队列中 89 for str0 in str: 90 palDeque.addRear(str0) 91 #定义一个flag 若为false则返回 92 flag = True 93 #直到双向队列的大小>1 等于一意味着字符数为奇数 等于零 意味为偶数 94 while palDeque.size() > 1 and flag: 95 front = palDeque.removeFront() 96 rear = palDeque.removeRear() 97 if front != rear: 98 flag = False 99 return flag 100 101 102 103 if __name__ == '__main__': 104 queue = pythonQueue.pythonQueue() 105 print(queue.isEmpty()) 106 queue.enqueue('dog') 107 print(queue.size()) 108 print(queue.items) 109 pop = queue.dequeue() 110 print(pop) 111 print(queue.isEmpty()) 112 ################################################################### 113 var = input("请输入排队列表以空格分隔：") 114 var = [str for str in var.split()] 115 var1 = input("请输入规则num：") 116 result = hotPotato(var, int(var1)) 117 print("最后一个人是：%s" %result) 118 ################################################################### 119 var = int(input("请输入时间（单位秒）：")) 120 var1 = int(input("打印机处理速率（页/分钟）：")) 121 printerTask(var, var1) 122 for i in range(10): 123 printerTask(var, var1) 124 ################################################################### 125 var = input("请输入要检测回文的字符串：") 126 print("检测结果："+str(palChecker(var)))
