尧图网站建设 
https://blog.csdn.net/qq_39562952/article/details/81298043https://www.cnblogs.com/RabbitHu/p/BIT.html 树状数组进阶（区间更新+单点查询，区间更新+区间查询）
https://blog.csdn.net/qq_39562952/article/details/81298043https://www.cnblogs.com/RabbitHu/p/BIT.html