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#201: lgvc
Accepted: : 239
#201: ucup-team267
Accepted: : 239
哈姆。
#203: ucup-team2045
Accepted: : 238
#204: ucup-team135
Accepted: : 235
#204: ucup-team3953
Accepted: : 235
#206: Otomachi_Una
Accepted: : 233
#207: ji_114514
Accepted: : 232
#208: LFAIJ
Accepted: : 231
誰のために希望描こう？
#208: ucup-team3586
Accepted: : 231
#210: cmll02
Accepted: : 230
#210: ucup-team5008
Accepted: : 230
#210: ushg8877
Accepted: : 230
#213: 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。
#213: ucup-team1817
Accepted: : 228
#215: __baozii__
Accepted: : 226
#215: hungry
Accepted: : 226
#217: ucup-team4269
Accepted: : 225
#218: huaxiamengjin
Accepted: : 224
#218: ideograph_advantage
Accepted: : 224
#220: ucup-team3099
Accepted: : 223
#220: ucup-team6336
Accepted: : 223
#222: 8BQube
Accepted: : 222
#222: xlwang
Accepted: : 222
#224: chenshi
Accepted: : 220
#225: Crying
Accepted: : 219
第五人格。
#225: jxy2012
Accepted: : 219
#227: shinonome_ena
Accepted: : 218
#228: sdoi
Accepted: : 217
$$P_{a_i}(x) = [t^{a_i}]\frac{1}{1-xF(t)}$$
#229: houzhiyuan
Accepted: : 216
#229: ucup-team870
Accepted: : 216
#229: wcyQwQ
Accepted: : 216
#232: makrav
Accepted: : 215
#233: le0n
Accepted: : 214
#233: ucup-team580
Accepted: : 214
#235: jrjyy
Accepted: : 213
#235: ucup-team3790
Accepted: : 213
#237: yoy68
Accepted: : 212
#237: yzhang
Accepted: : 212
如果结果不如你所愿，就在尘埃落定前奋力一搏
#239: ucup-team228
Accepted: : 211
#239: ucup-team3862
Accepted: : 211
#239: Wu_Ren
Accepted: : 211
#242: ningago
Accepted: : 209
#242: wsc2008
Accepted: : 209
#244: ucup-team5015
Accepted: : 208
#245: ucup-team123
Accepted: : 207
#245: yyyyxh
Accepted: : 207
What is OI (O_o)?
#247: do_while_true
Accepted: : 206
#247: zjjws
Accepted: : 206
#249: new_dawn_2
Accepted: : 203
#249: ucup-team1565
Accepted: : 203
#251: ucup-team3634
Accepted: : 202
#252: DitaMirika
Accepted: : 201
Face the fear,make the future.
#252: nhuang685
Accepted: : 201
#252: ucup-team3097
Accepted: : 201
#255: Misuki
Accepted: : 200
$\mathbb{C}[x]/(x^{2^n} - 1) \cong \mathbb{C}[x]/(x - \omega) \times \mathbb{C}[x]/(x - \omega^2) \times \ldots\times \mathbb{C}[x]/(x - \omega^{2^n})$
#255: rizynvu
Accepted: : 200
#255: ucup-team1055
Accepted: : 200
#255: ucup-team1617
Accepted: : 200
#255: ucup-team3774
Accepted: : 200
#260: ucup-team1126
Accepted: : 199
#261: _CLY_
Accepted: : 198
#261: Nova_NightWind0311
Accepted: : 198
#261: ucup-team1002
Accepted: : 198
#261: ucup-team3627
Accepted: : 198
#265: ucup-team3188
Accepted: : 197
#266: qwq
Accepted: : 195
$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$
#266: ucup-team029
Accepted: : 195
#266: ucup-team3966
Accepted: : 195
$$\underline{洹}我\underline{达}美\underline{乐}$$
#269: cooluo
Accepted: : 194
π⁴+π⁵≈e⁶ | Per Aspera Ad Astra
#270: gg_gong
Accepted: : 193
Who am I? Why am I here?
#271: Calculatelove
Accepted: : 192
Love all my perfect imperfections.
#271: pengpeng_fudan
Accepted: : 192
#271: ucup-team1191
Accepted: : 192
#274: ucup-team4740
Accepted: : 191
#274: ucup-team635
Accepted: : 191
#276: liuziao
Accepted: : 190
#276: std
Accepted: : 190
哼
#276: ucup-team1001
Accepted: : 190
utopian
#276: ucup-team2819
Accepted: : 190
#280: operator_
Accepted: : 188
#281: ucup-team1766
Accepted: : 187
#282: hshhh
Accepted: : 186
#282: myee
Accepted: : 186
与其诺诺以顺，不若谔谔以昌
#282: RDFZchenyy
Accepted: : 186
悟已往之不谏，知来者之可追。实迷途其未远，觉今是而昨非。
#282: ucup-team026
Accepted: : 186
#282: wangjunrui
Accepted: : 186
丢掉幻想，准备斗争！！！
#287: arnold518
Accepted: : 185
#287: masterhuang
Accepted: : 185
不要逃避自己的命运
#287: ucup-team1332
Accepted: : 185
#287: ucup-team3670
Accepted: : 185
#291: tzl_Dedicatus545
Accepted: : 184
忙碌着 无为着 继续
#292: mendicillin2
Accepted: : 181
#292: ucup-team3734
Accepted: : 181
#294: feecle6418
Accepted: : 180
gyh ak ioi
#294: ucup-team5101
Accepted: : 180
#294: ucup-team7032
Accepted: : 180
#297: C1942huangjiaxu
Accepted: : 179
#297: maojun
Accepted: : 179
#297: ucup-team3583
Accepted: : 179
#300: ax_by_c
Accepted: : 178
ZJOI 美好的事情可不可以降临在我身上