Python：每日一题 225

fan1993423

漫步云端〃 发表于 2019-7-22 15:39
就是实现这个逻辑的工作量。参考彩票，如果从33个数中选一个号码，那么中奖概率是1/33.但是如果从33个号 ...

这个我知道，我想问的是O(N)和O(N2)这个是指什么意思？

fallout.nj

新手·ing 发表于 2019-7-22 15:56
和我想的一样，所以超时了

原来你说的是程序运行的时间~看大家都用了enumerate()函数，初学第一次看到这个函数哦~~哈哈

漫步云端〃

fan1993423 发表于 2019-7-22 16:14
这个我知道，我想问的是O(N)和O(N2)这个是指什么意思？

https://blog.csdn.net/IAlexanderI/article/details/78945951
你看这个应该能知道，我是不懂，只是知道有这么个东西。

fallout.nj

关于提高效率，我感觉还是从算法上下手，从语句的效率上下手不是正途，以我现有的知识我有两个想法：
1 以原始列的最小值或者平均值为基数，跟原始列表中所有数字的差值形成新的列表，用这个新的列表来进行判断，不过这种方式只是将数值减小而已，核心还是基于冒泡法
2 让这个列表长度不断变小，pop出来对比列表内剩余值，从而形成最终结果
只是两个小点子，因为快下班了，就不做出来了

zsc198945

def fun225(temp):
    length=len(temp)
    res=[]
    print(length)
    for i in range(length):
        for j in range(i,length):
            if temp[j]>temp[i]:
                res.append(j-i)
                break
            if j==length-1:
                res.append(0)

    return res

temp=[73, 74, 75, 71, 69, 72, 76, 73]

print(fun225(temp))

sadangbeng

开始思考改进

新手·ing

zsc198945 发表于 2019-7-22 20:11
def fun225(temp):
    length=len(temp)
    res=[]

思路一致，超时

lucky邪神

#根据每日 气温 列表，请重新生成一个列表，对应位置的输入是你需要再等待多久温度才会升高超过该日的天数。
#如果之后都不会升高，请在该位置用 0 来代替。
#例如，给定一个列表 temperatures = [73, 74, 75, 71, 69, 72, 76, 73]，你的输出应该是 [1, 1, 4, 2, 1, 1, 0, 0]。
#提示：气温 列表长度的范围是 [1, 30000]。每个气温的值的均为华氏度，都是在 [30, 100] 范围内的整数。
   
import random
listlen = random.randrange(1,30000)
print (listlen)
temperature =out= [0]*listlen

def templist(num):
    i = 0
    while i < num :
        temp = random.randrange(30,100)
        temperature[i] = temp
        i += 1
    return temperature

temp =templist(listlen)
print('温度列表是：',temp)

for k in range(listlen):
    for j in range(k+1,listlen):
        if j==(listlen-1):
            out[k]=0
            break
        if temp[j]<temp[k]:
            continue
        else :
            out[k]=(j-k)
            break
    out[listlen-1]=0
print('输出列表是：',out)

最后的循环没搞好，输出结果是正确的，要下楼游泳，回来再想

fan1993423

这道题就是有两个循环就超时，要不超时就能在一个循环里完成

新手·ing

lucky邪神 发表于 2019-7-23 11:15
#根据每日 气温 列表，请重新生成一个列表，对应位置的输入是你需要再等待多久温度才会升高超过该日的天数 ...

喜提超时

新手·ing

fan1993423 发表于 2019-7-23 11:37
这道题就是有两个循环就超时，要不超时就能在一个循环里完成

你试试呗

fan1993423

新手·ing 发表于 2019-7-23 12:16
你试试呗

我看到题后也想了一下，最后跟你的思路一致，就没有去写代码了，O（N）我估计是实现不了，这个时候应该呼叫冬雪大佬啊。另我的帖子希望审核通过。

Spy666

朕要看

fan1993423

1. a=[73,74,75,69, 71, 76, 73, 74,72]
   
2. # a=[73, 74, 75, 71, 69, 72, 76, 73]
   
3. lenth=len(a)
   
4. res=[]
   
5. i=1
   
6. while lenth:
   
7.     try:
   
8.         if a[i]>a[0]:
   
9.             res.append(i)
   
10.             a.pop(0)
    
11.             i=0
    
12.         i+=1
    
13.     except:
    
14.         res.append(0)
    
15.         a.pop(0)
    
16.         i=1
    
17.         if  not len(a):break
    
18. print(res)
    

复制代码

想了一会儿，你看这个可以吗？只有一层循环！

新手·ing

fan1993423 发表于 2019-7-23 14:58
想了一会儿，你看这个可以吗？只有一层循环！

我觉得很厉害，
可是还是超时了，
本帖中所有代码都通不过一组数据，

1. 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]

复制代码

fan1993423

新手·ing 发表于 2019-7-23 15:08
我觉得很厉害，
可是还是超时了，
本帖中所有代码都通不过一组数据，

啥子哦，都只有一层循环了，还超时。难道不用循环吗，我实在想不出了不用循环的办法

新手·ing

fan1993423 发表于 2019-7-23 15:09
啥子哦，都只有一层循环了，还超时。难道不用循环吗，我实在想不出了不用循环的办法

这题好像要用栈做，然而我不会

fan1993423

新手·ing 发表于 2019-7-23 15:11
这题好像要用栈做，然而我不会

太高深了，已经超出对普通语法知识的考察了。算了。找个符合我们水平的练习题吧，坐等你出226题吧.

新手·ing

fan1993423 发表于 2019-7-23 15:13
太高深了，已经超出对普通语法知识的考察了。算了。找个符合我们水平的练习题吧，坐等你出226题吧.

咱们的水平，能做出来就可以了。
但是新东西还是要学的。

fan1993423

新手·ing 发表于 2019-7-23 15:15
咱们的水平，能做出来就可以了。
但是新东西还是要学的。

嗯，全栈先等会吧，我现在学的方向是机器学习，深度学习，神经网络，能把这些搞明白我就很满足了，高等数学，线性代数，统计论，概率论，英语。基础我自己都还要夯实