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Top Rated Accepted
#295: MarSer020
Accepted: : 236
#295: ucup-team135
Accepted: : 236
#297: iee
Accepted: : 235
#298: 2021cyq
Accepted: : 234
#298: ETK
Accepted: : 234
「我是星 我愿投身前途未卜的群星，为梦长明。」
#298: RDFZchenyy
Accepted: : 234
悟已往之不谏，知来者之可追。实迷途其未远，觉今是而昨非。
#298: ushg8877
Accepted: : 234
#302: thomas0702
Accepted: : 233
#303: lishujia
Accepted: : 232
#303: liulianll
Accepted: : 232
#303: wsxcb
Accepted: : 232
#306: ucup-team3586
Accepted: : 231
#306: ucup-team5984
Accepted: : 231
#306: ucup-team6748
Accepted: : 231
#309: ucup-team5008
Accepted: : 230
#309: ucup-team6719
Accepted: : 230
Are we robots?
#309: ucup-team8239
Accepted: : 230
#312: nathan4690
Accepted: : 229
#313: 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。
#313: ucup-team4269
Accepted: : 228
#315: cmll02
Accepted: : 227
#315: KobicGend
Accepted: : 227
#317: chenshi
Accepted: : 226
#318: ahihi1234
Accepted: : 225
#318: MatrixGroup
Accepted: : 225
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
#320: PTqwq_
Accepted: : 224
#320: SoyTony
Accepted: : 224
真実はいつもひとつ
#320: ucup-team7961
Accepted: : 224
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）
#323: travel
Accepted: : 223
#323: ucup-team2819
Accepted: : 223
#325: 8BQube
Accepted: : 222
#325: liuziao
Accepted: : 222
#327: ucup-team7870
Accepted: : 220
已完成今日我对着铁质的凳子踢了五下然后把那堆钢栏杆在地上滚了一下然后把椅子夹在了篮筐上大学习
#328: masterhuang
Accepted: : 219
不要逃避自己的命运
#328: ucup-team4478
Accepted: : 219
#328: ucup-team7334
Accepted: : 219
#328: xlwang
Accepted: : 219
#332: ANIG
Accepted: : 218
..
#332: binminh01
Accepted: : 218
#334: houzhiyuan
Accepted: : 217
#334: shinonome_ena
Accepted: : 217
#334: ucup-team6852
Accepted: : 217
#337: ucup-team870
Accepted: : 216
#338: gg_gong
Accepted: : 215
Who am I? Why am I here?
#338: jxy2012
Accepted: : 215
#338: ucup-team3862
Accepted: : 215
#341: intiger
Accepted: : 214
#341: jqh333
Accepted: : 214
#341: Lynia
Accepted: : 214
#341: ucup-team580
Accepted: : 214
#341: ucup-team7582
Accepted: : 214
#346: ucup-team3790
Accepted: : 213
#346: ucup-team4938
Accepted: : 213
乌龟风扇俱乐部
#346: wrhaco
Accepted: : 213
#349: ucup-team3966
Accepted: : 211
$$\underline{洹}我\underline{达}美\underline{乐}$$
#349: Wu_Ren
Accepted: : 211
#351: Acoipp
Accepted: : 210
#351: Arkweedy
Accepted: : 210
#351: Sai_tqwq
Accepted: : 210
#351: ucup-team228
Accepted: : 210
#351: yoy68
Accepted: : 210
#351: yzhang
Accepted: : 210
如果结果不如你所愿，就在尘埃落定前奋力一搏
#357: moriko
Accepted: : 209
#357: ucup-team4464
Accepted: : 209
#359: Calculatelove
Accepted: : 208
Love all my perfect imperfections.
#359: do_while_true
Accepted: : 208
#359: feecle6418
Accepted: : 208
gyh ak ioi
#359: Sktn0089
Accepted: : 208
#363: ucup-team123
Accepted: : 207
#364: nhuang685
Accepted: : 206
#365: ucup-team073
Accepted: : 205
#366: C1942huangjiaxu
Accepted: : 204
#366: Federal1Commander
Accepted: : 204
#366: yyyyxh
Accepted: : 204
What is OI (O_o)?
#369: Lzy_
Accepted: : 203
#369: ucup-team1565
Accepted: : 203
#371: new_dawn_2
Accepted: : 202
#371: piggy123
Accepted: : 202
#371: ucup-team3634
Accepted: : 202
#374: ucup-team1055
Accepted: : 200
#374: ucup-team1617
Accepted: : 200
#374: ucup-team3774
Accepted: : 200
#377: caijianhong
Accepted: : 199
#377: pengpeng_fudan
Accepted: : 199
#377: test_algth
Accepted: : 199
#377: ucup-team1126
Accepted: : 199
#377: ucup-team6072
Accepted: : 199
#382: frankly6
Accepted: : 198
#382: sleep
Accepted: : 198
#382: ucup-team7774
Accepted: : 198
#385: arnold518
Accepted: : 197
#385: ucup-team1002
Accepted: : 197
#385: ucup-team3188
Accepted: : 197
#385: ucup-team7683
Accepted: : 197
一直游到海水变蓝
#385: xDarkbluex
Accepted: : 197
#390: biank23
Accepted: : 196
#390: KafuuChinocpp
Accepted: : 196
#390: lazy1105
Accepted: : 196
ぼっち・ざ・ろっく！
#390: lwm7708
Accepted: : 196
https://lwm7708.github.io/entropy/
#390: qwq
Accepted: : 196
$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$