PCCP @ 2023-05-29 18:36:20
1.pushdown要放在前面
2.query 的时候不要忘记 pushdown 了
by LHQing @ 2023-05-29 18:39:06
线段树基础操作
by WhisperingWillow @ 2023-08-01 08:14:16
前教皇楼下！