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??
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#4488: Displace_
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$p(i,j)=\frac{j-1}{k-1}p(i-1,j)+\frac{k-j+1}{k-1}p(i-1,j-1),p(1,1)=1$
#4488: DUC27
Accepted: : 28
#4488: FBW2010
Accepted: : 28
这只FBW很懒，什么也没有留下。
#4488: fecto_elfilis
Accepted: : 28
Two Planet Approach the Roche Limit
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#4488: ucup-team1087
Accepted: : 28
青涩着 奔跑着 戴着晨光 载着希望 直至那个青涩的梦啊；热爱着 奋斗着 逆流而上 披荆斩棘 直至那颗璀璨的星啊
#4488: ucup-team1462
Accepted: : 28
皇子可爱捏
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#4488: ucup-team209
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