主要是偏重思维的。
by hereiszd @ 2023-03-21 14:36:23
@[hereiszd](/user/412595) NOIP2015 pjT3 怎么样
by RNTBW @ 2023-03-21 14:38:11
@[RNTBW](/user/643735) Orz
by hereiszd @ 2023-03-21 14:40:51
@[hereiszd](/user/412595) ARC100E
by Alphaban @ 2023-03-21 14:42:13
@[hereiszd](/user/412595) sto
by RNTBW @ 2023-03-21 14:56:52
众所周知差分≈前缀和。所以方差怎么样。
by fast_photon @ 2023-03-21 15:05:29
CF238D
by yllcm @ 2023-03-21 15:11:38
@[hereiszd](/user/412595) 今年NOIPT1
by yinhee @ 2023-03-21 15:38:25
@[hereiszd](/user/412595) 纯前缀和自然是上不了蓝的。如果你的意思是前缀和相关就行的话，那
[P8034](https://www.luogu.com.cn/problem/P8304) 推导过程用到了前缀和，代码也不难写，推荐。
by Hypercube @ 2023-03-21 17:24:40
https://www.luogu.com.cn/blog/over-knee-socks/post-difference
by Gumbo @ 2023-03-21 18:37:26