""" 
def judgeLeapYear(year):
    if year % 400 == 0:
        print("闰年")
        return
    elif year%100!=0 and year%4==0:    
        print("闰年")
        return
    else:
        print("平年")
        return

year = eval(input("请输入年份..."))
judgeLeapYear(year) """


""" 
def greatest_common_divisor(a,b):
    big, small = max(a,b), min(a,b)
    if big % small == 0:
        return small
    else:
        return greatest_common_divisor(small,big-small)

def least_common_multiple(a,b):
    result = a*b/greatest_common_divisor(a,b)
    return result

a = eval(input("请输入第一个数字..."))
b = eval(input("请输入第二个数字..."))
print("最大公约数: #",greatest_common_divisor(a,b))
print("最小公倍数: #",least_common_multiple(a,b))

 """

""" 
strInput = input("请输入一行字符...")
cntCE = 0
cntNum =0
cntSpace = 0
cntOther = 0
for c in strInput:
    if chr(19968)<=c<=chr(40896):
        cntCE += 1
    elif "a" <= c <= 'z' or "A" <= c <= 'Z':
        cntCE += 1
    elif "0" <= c <= '9':
        cntNum += 1
    elif c == " ":
        cntSpace += 1
    else:
        cntOther += 1
print(strInput)
print("中英文",cntCE)
print("数字",cntNum)
print("空格",cntSpace)
print("其他",cntOther) """



""" 

def getNum():
    while True:
        try:
            num = eval(input("请输入数字"))
            if type(num) != type(11):
                print("输入内容必须为整数！")
                continue
        except:
            print("输入内容必须为整数！")
            continue
        return num


import random
N = random.randint(1,1000)
# N = 900
cnt = 0
while True:
    num = getNum()
    cnt += 1
    if num == N:
        print("猜对了！！！")
        break
    elif num < N:
        print("猜小了！！！")
        continue
    elif num > N:
        print("猜大了！！！")
        continue
print("猜测次数:#",cnt) """




import random
correct_changed = 0
correct_unchanged = 0

repeatNum = 200000000
# repeatNum = 10000
totalNum = repeatNum
while (repeatNum > 0 ):

    doors = ["sheep","sheep","sheep"]
    index  = random.randint(0,2)
    doors[index] = "car"

    if doors[1] == "sheep" and doors[2] == "sheep":
        nextChoose = random.randint(1,2)
    elif doors[1] == "sheep":
        nextChoose = 2
    else:
        nextChoose = 1

    if doors[0]=='car':
        correct_unchanged += 1
    elif doors[nextChoose]=='car':
        correct_changed += 1
    repeatNum -= 1
print("\n\n蒙特卡洛模拟数量:#{0:->23,}次".format(totalNum))
print("选手更改选择的获胜概率:{0:->20,.8%}".format(correct_changed/totalNum))
print("选手坚持选择的获胜概率:{0:->20,.8%}\n\n".format(correct_unchanged/totalNum))


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