分享一些brain teaser

另类考题。希望有用。
求大米~~~~~~



1. 如果你有个森林小屋, 你每年去两次, 间隔六个月,
第一次带新鲜肉去放在冰箱冷冻室里, 假设因为可
能性断电造成肉化冻而损坏, 你在第一次去安置什
么样最简单/便宜的装置, 这样第二次去打开冰箱就
知道肉已经是坏的了?


2. 10升的圆柱形筒 只有一个2升刻度 只用水把所有刻度找出来

3. You've got someone working for you for seven days and a gold bar to pay them.
The gold bar is segmented in seven connected pieces. You must give them a
piece of gold at the end of every day. If you are only allowed to
make two breaks in the gold bar, how do you pay your worker?

4. You have 4 jars of pills. Each pill is a certain weight, except for contaminated
pills contained in one jar, where each pill is weight + 1. How could you tell
which jar had the contaminated pills in just one measurement?

5. 汽车里有个氢气球，如果急刹车，气球会怎么样？

6. 你有两个罐子，50个红色弹球，50个蓝色弹球。随机选出一个罐子，
随机选取出一个弹球.  怎么分配红球和篮球，给红色弹球最大的选中机会？
在你的计划中，得到红球的准确几率是多少？

7. 9个球, 有一个是坏的, 但是不知道是重还是轻, 给一个天平, 称多少次得出结果?

8. 地球的北极点有一个空军基地，有无穷架飞机。所有飞机的配置一模一样。每一架飞机携带的汽油恰好能供飞机沿一条经线从北极点飞到南极点。如果两架飞机相遇，每一架飞机都可以在空中把自己的一部分或者全部汽油给另外一架飞机。
要求：设计一个策略，使一架飞机能够从北极点沿西经90度经线飞至南极点，然后沿东经90度经线返回北极点。也就是说，这架飞机的轨迹是一个完整的大圆。此策略必须满足以下条件：
(1)所有加油的飞机也必须返回北极点；
(2)要求用到的飞机最少。

9. There are 100 seats on a plane, and 100 ticketed passengers.
The first 2 passengers are blind. They board the plane first,
taking random 2 seats. Other passengers boards one by one: if
he finds his seat taken, he will take a random seat. If his
seat is not taken, he takes his own seat.

Question, what is chance of the last passenger gets his own
seat?

10. 老鼠测毒水问题
有1000瓶水，其中有一瓶有毒，小白鼠只要尝一点带毒的水24小时后就会死亡，至少要多少只小白鼠才能在24小时时鉴别出那瓶水有毒。 --------------------------------------------- 准备10个空瓶(A)。然后给1000瓶(B)分别编号。 取B1，1的二进制->0001，在A1里面滴一滴； 取B2，2的二进制->0010，在A2里面滴一滴； 取B3，3的二进制->0011，在A1、A2分别滴一滴； 取B4，4的二进制->0100，在A3滴一滴； 。。。 滴完之后，分别拿A的10个瓶喂10只老鼠。 看那几只死了。就知道B第几号瓶有毒了。

11. 问题： 10个箱子，每个箱子10个苹果，其中一个箱子的苹果是9两/个， 其他的都是1斤/个。 要求利用一个秤，只秤一次，找出那个装9两/个的箱子?!注意只能称一次!   解答： 10筐苹果分别编上1-10号,从1号筐里面取1个苹果,2号取2个以此类推10号取10个,放在一起称! 拿出来的苹果个数是1+2+3+4+5+6+7+8+9+10=55个, 标准重量是一个苹果1斤,我们用标准重量乘以55个


12.  3 red hats and 2 blue hats. You me and a blind. Each one gets a
hat on his head but does not know the color. Each one can see others'
hats except the blind. First, I said I could not know what color I am
wearing. Then, you said you don't know what color of hat you are
wearing. Finally, the blind said he knows what color he is wearing.
Question is what color of hat he is wearing.



13. Four people getting accross the bridge. Only one lantern. Max of
two people a time getting accross the narrow bridge. The time taken to
get across are 1 2 7 9. How do you plan so that the time for all of
them get across is minimum.



14.  A family has two children. Giving that one of them is a girl what
is the chance of the other is a boy.

15. there are 100 lights, which are initially off. There are 100 people. Assume the number n-th person, he will switch the light (k × n, k = 1,2,3,...)  (if the light was on, turn it off; vice verse). At the end, which lights are on?


参考答案

您好！
本帖隐藏的内容需要积分高于 88 才可浏览
您当前积分为 0。
使用VIP即刻解锁阅读权限或查看其他获取积分的方式

游客，您好！
本帖隐藏的内容需要积分高于 88 才可浏览
您当前积分为 0。
VIP即刻解锁阅读权限 或 查看其他获取积分的方式
Unlock interview details and practice with AI
Curated Interview Questions from Top Companies

请问有没有什么brain teaser书啊

2. 10升的圆柱形筒 只有一个2升刻度 只用水把所有刻度找出来
如果圆柱形筒规则，横截面一样，取一半高度不行吗？
如果横截面不一样，倾斜也不对吧