题解"/>
LUOGU P4345 SHOI2015超能粒子炮·改题解
f ( n , k ) = ∑ i = 0 k C n i % p f(n,k)=\sum_{i=0}^kC_n^i\%p f(n,k)=i=0∑kCni%p
f ( n , k ) = ∑ i = 0 k C n p i p C n % p i % p % p f(n,k)=\sum_{i=0}^kC_{\frac{n}{p}}^{\frac{i}{p}}C_{n\%p}^{i\%p}\%p f(n,k)=i=0∑kC
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LUOGU P4345 SHOI2015超能粒子炮·改题解
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