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QOJ 常见问题(Q&A) by Qingyu 2023-03-23 22:14:28
QOJ 更新日志(2023 Apr) by Qingyu 2023-01-06 20:27:29
 
 
 
 
 
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#имя пользователяДевизЗадачи
/Qingyu5901
1larryzhong943
2xiaowuc1you're a half a world away, but in my mind I whisper every single word you say519
3MaMengQi465
4ZhaoZiLong464
5HuangHanSheng443
6ZhangYiDe442
7GuanYunchang438
8flowerqingyu txdy!335
9hyddQingyu txdy $\\$ $\text{If my armor breaks, I'll fuse it back together}$312
10Crysfly$$f(x)=(\sum_{i=0}^{n-1}\frac{y_i}{(x-q^i)\prod_{j\ne i}(q^i-q^j)})\prod_{i=0}^{n-1}(x-q^i)$$ 257
11tricyzhkx230
12chenshi216
13zhouhuanyi199
14maspy193
15Wu_Ren189
16He_Ren184
17repoman$$\prod_{i=0}^{n-1} (1+q^iz) = \sum_{i=0}^n q^{i(i-1)/2}\binom ni_q z^i$$176
18qwq$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$170
19alpha1022$$\frac{1}{n_1!n_2!}(1-y)^{n_1+n_2+2} \left(\sum_{j\ge 0} y^j(t+j)^{n_1} \right) \left(\sum_{j\ge 0} y^j((j+1)-t)^{n_2} \right)$$163
20ckiseki161
21feecle6418gyh ak ioi160