摘要：
Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the ... 阅读全文
摘要：
前言 最近初学树状数组，原理还不是太理解，等自己什么时候完全理解了再自己总结一番。掌握树状数组~彻底入门先贴一下树状数组的模板代码：int lowbit(int i){ return i & -i;//或者是return i-(i&(i-1));表... 阅读全文