归档 2015年10月

题目描述：

You are playing the following Bulls and Cows game with your friend: You write a 4-digit secret number and ask your friend to guess it, each time your friend guesses a number, you give a hint, the hint tells ...

托管在SAE上的Django应用，如果使用共享型MySQL数据库服务，可以通过配置数据库路由，实现读写分离。利用SAE从库的价格优势，减少云豆开销。

SAE共享型MySQL数据库的计费策略：

新浪云SAE共享型数据库支持读写分离（Read/Write Splitting），即主数据库（Master）处理事务性增、改、删操作（INSERT、UPDATE、DELETE），而从数据库（Slave）处理SELECT查询操作。

并且从SAE共享型MySQL的使用价格上来看：

共享型MySQL（主库）
请求次数10000次    400云豆/百万次    4元/百万次
磁盘容量20MB    5云豆/GB/天    0.05元/GB/天

共享型MySQL（从库 ...

题目描述：

Given a binary tree, find the maximum path sum.

For this problem, a path is defined as any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The path does not ...

题目描述：

Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later ...

题目描述：

Recently you learned about substitution ciphers. This problem is about such a cipher. All strings in this problem (both encrypted and decrypted ones) will consist of only uppercase English letters ('A'-'Z').

When encrypting text using a substitution cipher ...