n***a
发帖数: 222 | 1 板上好像没人发过， 大家讨论一下：
Design a system to hand out telephone numbers for Google voice.
You want to present numbers to people such that:
a person sees 10 numbers at a time
no two people should see the same numbers at the same time
they get 2 minutes to choose one of those numbers or ask for more. If they
choose one after the 2 minutes are expired, the request fails.
Where you would put the various data elements - in a database, application
servers, front-ends or the browser.
What kinds of data structures you would use. |
g*****g
发帖数: 34805 | 2 一个RDBMS就搞定了，显示10个号码的时候打上用户名和时间戳，对电话号码索引。
【在 n***a 的大作中提到】
: 板上好像没人发过， 大家讨论一下：
: Design a system to hand out telephone numbers for Google voice.
: You want to present numbers to people such that:
: a person sees 10 numbers at a time
: no two people should see the same numbers at the same time
: they get 2 minutes to choose one of those numbers or ask for more. If they
: choose one after the 2 minutes are expired, the request fails.
: Where you would put the various data elements - in a database, application
: servers, front-ends or the browser.
: What kinds of data structures you would use.
|
g******o
发帖数: 10 | 3 如何找到the next 10 available numbers |
l******s
发帖数: 3045 | |
u***n
发帖数: 21026 | 5 用lock不可以吗，require的时候好比是 write，拿到lock后才能对这些号码操作，2分
钟后失效，remove lock，后面的人就能看到了。 |
n*******s
发帖数: 17267 | 6 10个号码没说清楚，估计是都不能重复，这题挺简单的，不过可以引出来比较有趣的话题
【在 l******s 的大作中提到】
: 我很笨，看了半天没明白题意，求教讲解？
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