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#293: ucup-team3099
Accepted: : 276
#295: wangjunrui
Accepted: : 275
丢掉幻想，准备斗争！！！
#296: ucup-team1525
Accepted: : 273
#297: dxbt
Accepted: : 272
#297: ucup-team7961
Accepted: : 272
目标：先刷500题看看实力有没有进步;备忘录：https://contest.ucup.ac/modify_team/ucup-team7961（更新队伍信息）
#299: Forever_Young
Accepted: : 271
#299: KevinLikesCoding
Accepted: : 271
$$\pi(n)=\phi\left(n,\pi\left(n^\frac{1}{3}\right)\right)-\pi\left (n^\frac{1}{3} \right ) + 1 - \sum_{p\in \left(n^\frac{1}{3},n^\frac{1}{2} \right] } \pi \left (\frac{n}{p} \right )-\pi(p)+1 $$
#301: CSQ
Accepted: : 270
#302: AFewSuns
Accepted: : 269
$\displaystyle\sum_{n \geq 0}{(x+y)^n\frac{u^n}{n!}}=\sum_{k \geq 0}\frac{x}{x-kz}(x-kz)^k\frac{u^k}{k!}\sum_{l \geq 0}\frac{(y+kz)^l}{l!}u^l$
#303: ucup-team122
Accepted: : 265
#303: yangjiaxi
Accepted: : 265
#305: ETO_leader
Accepted: : 263
#305: SirTechnical
Accepted: : 263
#307: ucup-team110
Accepted: : 262
#307: XY_Eleven
Accepted: : 262
#309: garam1732
Accepted: : 260
#310: hydd
Accepted: : 259
But are we all lost stars trying to light up the dark?
#310: ucup-team1447
Accepted: : 259
没队要
#310: wcyQwQ
Accepted: : 259
#313: He_Ren
Accepted: : 258
#313: huaxiamengjin
Accepted: : 258
#313: tzl_Dedicatus545
Accepted: : 258
忙碌着 无为着 继续
#316: ucup-team4527
Accepted: : 257
#316: ucup-team5071
Accepted: : 257
#318: bamboo123
Accepted: : 256
#319: luanyanjia
Accepted: : 255
#319: ushg8877
Accepted: : 255
#321: xDarkbluex
Accepted: : 253
#322: Seniorious
Accepted: : 252
We do not know and will not know
#323: elacient
Accepted: : 251
#323: hshhh
Accepted: : 251
#323: jiamengtong
Accepted: : 251
#323: nanika
Accepted: : 251
#323: ucup-team3515
Accepted: : 251
#328: travel
Accepted: : 250
#328: ucup-team6749
Accepted: : 250
#330: DinoHadzic
Accepted: : 249
#330: IllusionaryDominance
Accepted: : 249
#330: ucup-team4464
Accepted: : 249
#330: Zero_OP
Accepted: : 249
#334: as_lyr
Accepted: : 248
#334: ucup-team180
Accepted: : 248
#336: tricyzhkx
Accepted: : 247
#336: ucup-team2307
Accepted: : 247
#338: ucup-team2172
Accepted: : 246
法克皮百吨
#339: 617lyq
Accepted: : 245
#339: jqh333
Accepted: : 245
#339: liuziao
Accepted: : 245
#339: ucup-team1293
Accepted: : 245
#343: Diaosi
Accepted: : 243
#343: jrjyy
Accepted: : 243
#343: Register
Accepted: : 243
#343: ucup-team2045
Accepted: : 243
#347: lunchbox
Accepted: : 242
#347: nhuang685
Accepted: : 242
#349: nathan4690
Accepted: : 241
#349: Sktn0089
Accepted: : 241
#349: std
Accepted: : 241
哼
#352: carrotqq
Accepted: : 239
#352: ucup-team267
Accepted: : 239
哈姆。
#354: ucup-team7725
Accepted: : 238
#355: ucup-team135
Accepted: : 236
#356: iee
Accepted: : 235
#356: MarSer020
Accepted: : 235
#358: ETK
Accepted: : 234
「我是星 我愿投身前途未卜的群星，为梦长明。」
#358: Journey_to_Edge_Ring
Accepted: : 234
ECUST_飞向边界环 (est. 2025)Member:hatertumu1thuguanfu
#358: wsxcb
Accepted: : 234
#361: 2021cyq
Accepted: : 233
#361: GotoHiotori
Accepted: : 233
我大概，一辈子也忘不了 CRYCHIC
#361: RDFZchenyy
Accepted: : 233
悟已往之不谏，知来者之可追。实迷途其未远，觉今是而昨非。
#361: ucup-team7466
Accepted: : 233
#361: ucup-team7879
Accepted: : 233
#366: sunnygreen
Accepted: : 232
https://www.luogu.com.cn/article/1w0l0mmq
#366: ucup-team4269
Accepted: : 232
#368: ChiFAN
Accepted: : 231
你是翅膀也是我肩膀
#368: MatrixGroup
Accepted: : 231
どうか どうか どうか | 可是真实的人生，必定是单调、残酷，而缺乏色彩的
#368: moriko
Accepted: : 231
#368: ucup-team3586
Accepted: : 231
#368: ucup-team5984
Accepted: : 231
#368: ucup-team6748
Accepted: : 231
#368: ucup-team7832
Accepted: : 231
#375: ucup-team5008
Accepted: : 230
#375: ucup-team7754
Accepted: : 230
#375: x3x3
Accepted: : 230
#378: zdczdc
Accepted: : 229
#379: Calculatelove
Accepted: : 228
Love all my perfect imperfections.
#379: qzez
Accepted: : 228
对于无向图的情况，基尔霍夫矩阵为 $K=D-A$，其中 $D$ 为度数矩阵，$A$ 为邻接矩阵。树的个数为去掉 $K$ 一行一列的行列式的值。对于外向树，$D$ 为每个点的入边度数和，内向树相反。此时需要去掉根所在行列。BEST 定理：有向欧拉图的欧拉回路个数为：内向树个数乘以 $\prod\limits_{i=1}^{n}deg_i$，其中 $deg_i$ 为 $i$ 号点的度数。
#379: ucup-team7899
Accepted: : 228
#382: cmll02
Accepted: : 227
#382: ucup-team7683
Accepted: : 227
一直游到海水变蓝
#384: chenshi
Accepted: : 226
#385: feecle6418
Accepted: : 225
gyh ak ioi
#385: lnw143
Accepted: : 225
what doesn't kill you makes you stronger
#387: Crosselle
Accepted: : 224
#387: SoyTony
Accepted: : 224
真実はいつもひとつ
#387: xmdxmdxmd
Accepted: : 224
#390: 8BQube
Accepted: : 223
#390: ucup-team2819
Accepted: : 223
#392: Prime
Accepted: : 222
#393: intiger
Accepted: : 221