Tingting Tao taylortao
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| ALU(Arithmetic logic unit) -> L1 cache -> L2 cache -> memory -> disk -> network/cloud | |
| Time = calculate time + data move time(that's why we need cache) | |
| cache replacement strategy: LRU least recently used | |
| locality principle | |
| copy and prefetch | |
| latency numbers: http://people.eecs.berkeley.edu/~rcs/research/interactive_latency.html |
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| What is it? | |
| the process of defining archiecture, components, modules, interfaces and data for a system to satisfy specified requirement. | |
| 1. scenario | |
| register/log in, play file, recommendation | |
| 2.necessary | |
| user: | |
| daily active user | |
| concurrency user |
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| At first: | |
| You cannot connect dots looking forward, but you can connect dots looking backward. By Steve jobs | |
| compound interest is the most powerful weapon in the universe. | |
| Freedom, Fitness, Family. | |
| Always know your priority queue. |
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| 非常有意思的一组正则小游戏，http://regex.alf.nu/ | |
| 积分规则：匹配左边（一个10分），不匹配右边的（错误一个扣10分），式子长度越短越好，1个字符扣1分。 | |
| 中间有被难到的题目参考了Gist： https://gist.github.com/Davidebyzero/9221685 | |
| 我看懂了的，顺便也记录一下我的理解。 | |
| Regex: short of regular expression. | |
| Warmup | |
| foo，哈哈，送分题 | |
| Anchors | |
| You are deducted one point per character you use, and ten if you match something you shouldn’t. | |
| 我写的是ick$，后来发现还有k$，太坏了。。。考察点是:start/end of string anchors. |