USACO的标准代码，DD_ENG大神的代码，题目比较多，包括了很多算法和数据结构。是IO选手必备的代码。-Standard code, DD_ENG God of USACO entitled more, including a lot of algorithms and data structures. IO players essential code.

大数据处理利器 世界目前性能最快的map和完美哈希算法 -Large data processing tool, the performance of the world s fastest map and perfect hash algorithm