good blog

树状数组：

http://blog.csdn.net/lulipeng_cpp/article/details/7816527

http://www.cnblogs.com/huangxincheng/archive/2012/12/05/2802858.html

http://www.cppblog.com/linyangfei/archive/2008/09/24/62688.html

把《编程珠玑》读薄 :

http://hawstein.com/posts/make-thiner-programming-pearls.html