QOJ.ac
QOJ
Top Rated Accepted
#101: Sorting
Accepted: : 303
ㅗ오ㅗ
#102: N_z_
Accepted: : 302
#103: ucup-team5027
Accepted: : 298
此账号为王泰翔专用单挑账号，若此账号每日未通过任何题目，欢迎私信 ucup-team5027：“王泰翔加训”。
#104: hhoppitree
Accepted: : 294
$e^{i\pi}+1=0$
#105: ucup-team3161
Accepted: : 289
#105: ucup-team3727
Accepted: : 289
#105: zhaohaikun
Accepted: : 289
#105: znstz
Accepted: : 289
#109: PlentyOfPenalty
Accepted: : 288
高亮的是我们，我们是青鱼家军！
#110: chenxinyang2006
Accepted: : 287
#110: james1BadCreeper
Accepted: : 287
他明白 他明白 我给不起
#112: alpha1022
Accepted: : 286
$$\frac{1}{n_1!n_2!}(1-y)^{n_1+n_2+2} \left(\sum_{j\ge 0} y^j(t+j)^{n_1} \right)\left(\sum_{j\ge 0} y^j((j+1)-t)^{n_2} \right)$$
#113: Afterlife
Accepted: : 285
🤯
#114: ucup-team878
Accepted: : 283
#115: ucup-team3612
Accepted: : 281
#116: ucup-team1525
Accepted: : 274
#117: AFewSuns
Accepted: : 270
$\displaystyle\sum_{n \geq 0}{(x+y)^n\frac{u^n}{n!}}=\sum_{k \geq 0}\frac{x}{x-kz}(x-kz)^k\frac{u^k}{k!}\sum_{l \geq 0}\frac{(y+kz)^l}{l!}u^l$
#118: ucup-team896
Accepted: : 269
#119: ucup-team122
Accepted: : 266
#120: Forever_Young
Accepted: : 263
#121: ucup-team1447
Accepted: : 260
没队要
#121: ucup-team3607
Accepted: : 260
#123: ucup-team045
Accepted: : 256
#124: Max_s_xaM
Accepted: : 255
#125: bulijiojiodibuliduo
Accepted: : 253
#125: ucup-team3602
Accepted: : 253
#127: JohnAlfnov
Accepted: : 251
progynova
#127: ucup-team180
Accepted: : 251
#129: tricyzhkx
Accepted: : 250
#130: He_Ren
Accepted: : 249
#131: ucup-team2172
Accepted: : 247
法克皮百吨
#131: ucup-team2307
Accepted: : 247
#133: iee
Accepted: : 245
#133: ucup-team110
Accepted: : 245
#133: ucup-team1293
Accepted: : 245
#133: zhoukangyang
Accepted: : 245
#137: Register
Accepted: : 243
#138: MiniLong
Accepted: : 242
#138: ucup-team3705
Accepted: : 242
#140: LuSter_M
Accepted: : 241
#141: IllusionaryDominance
Accepted: : 240
#142: ucup-team267
Accepted: : 239
哈姆。
#143: sdoi
Accepted: : 237
$$P_{a_i}(x) = [t^{a_i}]\frac{1}{1-xF(t)}$$
#144: tarjen
Accepted: : 236
Nanani Nanani 喜欢喜欢喜欢training record:https://wiki.cubercsl.cn/Antiamuny_Computation_(2023)https://wiki.cubercsl.cn/Mako,suki_(2024)
#144: ucup-team018
Accepted: : 236
#146: ucup-team2045
Accepted: : 233
#147: SorahISA
Accepted: : 232
#147: ucup-team3586
Accepted: : 232
#147: ucup-team902
Accepted: : 232
#150: ucup-team3556
Accepted: : 231
#151: qzez
Accepted: : 229
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。
#152: ucup-team1817
Accepted: : 228
#153: ucup-team4217
Accepted: : 227
#154: ucup-team4527
Accepted: : 225
#154: ushg8877
Accepted: : 225
#156: ucup-team425
Accepted: : 224
#157: ucup-team3648
Accepted: : 223
#158: 8BQube
Accepted: : 222
#159: chenshi
Accepted: : 221
#159: karuna
Accepted: : 221
#161: ucup-team870
Accepted: : 215
#162: Hiraethsoul
Accepted: : 214
#162: ucup-team5062
Accepted: : 214
#164: carrotqq
Accepted: : 213
#164: repoman
Accepted: : 213
$$\prod_{i=0}^{n-1} (1+q^iz) = \sum_{i=0}^n q^{i(i-1)/2}\binom ni_q z^i$$
#164: ucup-team3790
Accepted: : 213
#167: ucup-team3475
Accepted: : 212
#168: ucup-team228
Accepted: : 211
#168: ucup-team3862
Accepted: : 211
#170: OIer_kzc
Accepted: : 210
#171: yzhang
Accepted: : 209
如果结果不如你所愿，就在尘埃落定前奋力一搏
#172: yyyyxh
Accepted: : 208
What is OI (O_o)?
#173: ucup-team123
Accepted: : 207
#173: UESTC_DECAYALI
Accepted: : 207
#175: Wu_Ren
Accepted: : 206
#176: ucup-team1565
Accepted: : 205
#176: ucup-team3515
Accepted: : 205
#176: ucup-team580
Accepted: : 205
#179: new_dawn_2
Accepted: : 203
#180: 11d10xy
Accepted: : 202
格言尚未上传，请稍后查看！
#180: do_while_true
Accepted: : 202
#182: qwq
Accepted: : 201
$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$
#182: ucup-team1055
Accepted: : 201
#182: ucup-team1617
Accepted: : 201
#185: ucup-team1002
Accepted: : 199
#185: ucup-team1126
Accepted: : 199
#187: KiharaTouma
Accepted: : 198
<https://www.cnblogs.com/KiharaTouma>
#187: Nova_NightWind0311
Accepted: : 198
#187: ucup-team3634
Accepted: : 198
#190: ucup-team029
Accepted: : 196
#190: ucup-team5077
Accepted: : 196
#192: zjy0001
Accepted: : 195
#193: Crying
Accepted: : 193
第五人格。
#193: LaVuna47
Accepted: : 193
#193: rqoi031
Accepted: : 193
#193: ucup-team1191
Accepted: : 193
#197: ucup-team635
Accepted: : 192
#198: _map_
Accepted: : 191
map<problem_statement,vector<pair<oj,problem_id>>>
#198: ucup-team572
Accepted: : 191
#200: ucup-team135
Accepted: : 190