QOJ.ac
QOJ
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#390: ucup-team6748
Accepted: : 231
#395: lnw143
Accepted: : 230
what doesn't kill you makes you stronger
#395: ucup-team5008
Accepted: : 230
#397: Crosselle
Accepted: : 229
#397: huangleyi
Accepted: : 229
#399: Calculatelove
Accepted: : 228
Love all my perfect imperfections.
#399: 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。
#399: Tianyiwei
Accepted: : 228
#399: zhenghanyun
Accepted: : 228
#403: cmll02
Accepted: : 227
#404: chenshi
Accepted: : 226
#405: feecle6418
Accepted: : 225
gyh ak ioi
#405: Prime
Accepted: : 225
#405: zzzYheng
Accepted: : 225
你好我的朋友
#408: kangleni
Accepted: : 224
#408: SoyTony
Accepted: : 224
真実はいつもひとつ
#410: 8BQube
Accepted: : 223
#410: ucup-team2819
Accepted: : 223
#412: liyelin
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#412: ucup-team7678
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#414: 2147483647str
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#415: ucup-team7796
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#415: Wansur
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#418: masterhuang
Accepted: : 219
不要逃避自己的命运
#418: ucup-team4478
Accepted: : 219
#418: xlwang
Accepted: : 219
#421: binminh01
Accepted: : 218
#421: hcywoi
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#421: kjhhjki
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#424: alex9801
Accepted: : 217
#424: Arkweedy
Accepted: : 217
#424: houzhiyuan
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#424: shinonome_ena
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#424: ucup-team5656
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有点小幽默
#424: ucup-team7701
Accepted: : 217
#430: fast_photon
Accepted: : 216
#430: rhineofts
Accepted: : 216
#430: ucup-team6852
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#430: ucup-team7713
Accepted: : 216
#434: gg_gong
Accepted: : 215
Who am I? Why am I here?
#434: infCraft
Accepted: : 215
#434: jxy2012
Accepted: : 215
#434: ucup-team3862
Accepted: : 215
#434: ucup-team7733
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#434: ucup-team870
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#440: oldcatsthecat
Accepted: : 214
#440: tryandtryagain
Accepted: : 214
#440: ucup-team580
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#440: ucup-team7582
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#444: sherman2022
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#444: ucup-team3790
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#446: ucup-team073
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#446: ucup-team2262
Accepted: : 212
#446: ucup-team4938
Accepted: : 212
乌龟风扇俱乐部
#449: ucup-team3966
Accepted: : 211
$$\underline{洹}我\underline{达}美\underline{乐}$$
#449: ucup-team7774
Accepted: : 211
#449: Wu_Ren
Accepted: : 211
#449: YMH_fourteen
Accepted: : 211
$$4+9+19+10+15+9+14+20=\mathbf{100}$$
#453: IvanZhang2009
Accepted: : 210
#453: ucup-team228
Accepted: : 210
#453: yoy68
Accepted: : 210
#453: yzhang
Accepted: : 210
如果结果不如你所愿，就在尘埃落定前奋力一搏
#457: do_while_true
Accepted: : 209
#457: Lzy_
Accepted: : 209
#457: yimuhua
Accepted: : 209
3115201
#460: KnownError_
Accepted: : 207
#460: mod998244353
Accepted: : 207
#460: ucup-team123
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#463: bykem
Accepted: : 206
#463: C1942huangjiaxu
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#463: cyx
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#463: jinqihao2023
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#463: juan_123
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#468: pk661
Accepted: : 205
#468: StefanSebez
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#468: ucup-team7255
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#471: Federal1Commander
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#471: Francisco_Martin
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#471: frankly6
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#471: oceeff
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#471: yyyyxh
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What is OI (O_o)?
#476: atm10
Accepted: : 203
The more we love the woman the more we less more more
#476: ucup-team1565
Accepted: : 203
#476: Yarema
Accepted: : 203
#479: diandian2020
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#479: new_dawn_2
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#479: ucup-team3634
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#482: liujunyi123
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#482: nealzane
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#482: ucup-team1617
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Accepted: : 199
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#489: pengpeng_fudan
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#489: rogeryi
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