QOJ.ac
QOJ
比赛排行榜 通过数
#492: moriko
Accepted: : 231
#492: ucup-team6748
Accepted: : 231
#492: ucup-team8532
Accepted: : 231
#497: lsj2009
Accepted: : 230
#497: MatrixGroup
Accepted: : 230
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
#497: ucup-team3586
Accepted: : 230
#497: ucup-team5008
Accepted: : 230
#497: ucup-team7697
Accepted: : 230
#497: YoruKiri
Accepted: : 230
#503: ucup-team5984
Accepted: : 229
#504: Calculatelove
Accepted: : 228
Love all my perfect imperfections.
#504: kjhhjki
Accepted: : 228
#504: 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。
#504: rainygame
Accepted: : 228
#504: Wansur
Accepted: : 228
#509: cmll02
Accepted: : 227
#509: do_while_true
Accepted: : 227
#509: KnownError_
Accepted: : 227
#509: ucup-team2262
Accepted: : 227
#509: UESTC_MatchaParfait
Accepted: : 227
#514: feecle6418
Accepted: : 226
gyh ak ioi
#515: asdfsdf
Accepted: : 225
#515: chenshi
Accepted: : 225
#515: codeWeirdo
Accepted: : 225
#515: zzzYheng
Accepted: : 225
你好我的朋友
#519: Camille
Accepted: : 224
#519: EasonHe
Accepted: : 224
#519: slyra
Accepted: : 224
#519: ucup-team7532
Accepted: : 224
#519: ucup-team7678
Accepted: : 224
#519: ZnPdCo
Accepted: : 224
#525: 8BQube
Accepted: : 223
#525: andreyDagger
Accepted: : 223
#525: Nanako7_ix
Accepted: : 223
好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死，好想去死。
#525: SoyTony
Accepted: : 223
真実はいつもひとつ
#525: ucup-team2819
Accepted: : 223
#530: ucup-team7411
Accepted: : 222
#531: monirr
Accepted: : 221
#532: Arkweedy
Accepted: : 220
#532: msk_sama
Accepted: : 220
#532: TheBlackFire
Accepted: : 220
#532: xlwang
Accepted: : 220
#536: houzhiyuan
Accepted: : 219
#536: masterhuang
Accepted: : 219
不要逃避自己的命运
#536: Survivor_winner
Accepted: : 219
$$|\mathcal F^\downarrow||\mathcal G^\uparrow|\ge 2^n|\mathcal F^\downarrow\cap \mathcal G^\uparrow|$$
#536: ucup-team4478
Accepted: : 219
#540: ucup-team5656
Accepted: : 218
有点小幽默
#541: aiden3233
Accepted: : 217
came from BOJ...
#541: alex9801
Accepted: : 217
#541: bnsczr
Accepted: : 217
#541: fast_photon
Accepted: : 217
#541: shinonome_ena
Accepted: : 217
#541: ucup-team968
Accepted: : 217
#547: rhineofts
Accepted: : 216
#547: ucup-team6634
Accepted: : 216
#547: ucup-team7774
Accepted: : 216
#547: ucup-team8618
Accepted: : 216
#551: gg_gong
Accepted: : 215
Who am I? Why am I here?
#551: IvanZhang2009
Accepted: : 215
#551: jxy2012
Accepted: : 215
#551: ucup-team3862
Accepted: : 215
#551: ucup-team6852
Accepted: : 215
#551: ucup-team870
Accepted: : 215
#557: chenyx
Accepted: : 214
#557: infCraft
Accepted: : 214
#557: NineSuns
Accepted: : 214
#557: StefanSebez
Accepted: : 214
#557: ucup-team580
Accepted: : 214
#557: ucup-team7582
Accepted: : 214
#563: ucup-team3790
Accepted: : 213
#563: yoy68
Accepted: : 213
#565: liangbowen
Accepted: : 212
#565: Lzy_
Accepted: : 212
#565: sherman2022
Accepted: : 212
#565: ucup-team4938
Accepted: : 212
乌龟风扇俱乐部
#569: gmroh
Accepted: : 211
#569: pk661
Accepted: : 211
#569: ucup-team3966
Accepted: : 211
$$\underline{洹}我\underline{达}美\underline{乐}$$
#569: ucup-team8683
Accepted: : 211
#569: Wu_Ren
Accepted: : 211
#569: zr
Accepted: : 211
#575: diandian2020
Accepted: : 210
#575: treks
Accepted: : 210
#575: ucup-team228
Accepted: : 210
#575: YMH_fourteen
Accepted: : 210
$$4+9+19+10+15+9+14+20=\mathbf{100}$$
#579: yzhang
Accepted: : 208
如果结果不如你所愿，就在尘埃落定前奋力一搏
#580: OIer_Automation
Accepted: : 207
#580: ucup-team123
Accepted: : 207
#580: ucup-team3774
Accepted: : 207
#580: ucup-team8660
Accepted: : 207
#584: frankly6
Accepted: : 206
#584: rui_er
Accepted: : 206
可爱
#584: ucup-team7235
Accepted: : 206
#584: zlxFTH
Accepted: : 206
#588: juan_123
Accepted: : 205
#588: liuhua_e
Accepted: : 205
#590: annyeong1
Accepted: : 204
#590: Federal1Commander
Accepted: : 204
#590: Lenisel
Accepted: : 204
#590: oceeff
Accepted: : 204