(~~滑稽~~)
by longlongzhu123 @ 2019-04-18 17:10:12
@[zzy2333](/space/show?uid=118058) 请问为什么要加0啊
by bjxdw @ 2019-07-07 13:17:13
@[bjxdw](/space/show?uid=26926) 前缀和之后要想提取一段区间应该是
```cpp
s[r]^s[l-1]
```
l-1可能是0
by zzy2333 @ 2019-07-07 13:55:30
@[zzy2333](/space/show?uid=118058) 那如果没有会怎么样啊?????
by bjxdw @ 2019-07-08 08:42:01
@[bjxdw](/space/show?uid=26926) 没有可能就会wa
by zzy2333 @ 2019-07-08 09:56:50
感谢, 一下子把我的代码hack掉了
by grass8cow @ 2020-07-03 15:38:26
这数据居然帮我调出了RE错误(
by suxxsfe @ 2020-10-06 22:37:44
感谢
by guanjinquan @ 2021-08-25 20:58:58
谢谢
by 123886a123886 @ 2022-02-26 16:09:18
感谢
by helium347 @ 2022-05-19 10:13:05