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Differences From Artifact [4dd19b13cd92c7f0]:

To Artifact [e5662c451b84a185]:


24 24 mint operator+(mint x, mint y) { return x+=y; } 25 25 mint operator-(mint x, mint y) { return x-=y; } 26 26 mint operator*(mint x, mint y) { return x*=y; } 27 27 mint operator/(mint x, mint y) { return x/=y; } 28 28 vector<mint> FAC_(1,1); 29 29 mint FAC(LL n) { while( FAC_.size()<=n ) FAC_.push_back( FAC_.back()*FAC_.size() ); return FAC_[n]; } 30 30 mint C(LL n, LL k) { return k<0 || n<k ? 0 : FAC(n) / (FAC(k) * FAC(n-k)); } 31 - 32 -// Pascal's triangle: if O(1) nCk is needed. 33 -vector< vector<mint> > CP_(2001); 31 +vector< vector<mint> > CP_; // Pascal's triangle: if O(1) nCk is needed. 34 32 mint C(LL n, LL k) { 35 - if(CP_[0].empty()) { 36 - CP_[0].push_back(1); 37 - for(int nn=1; nn<CP_.size(); ++nn) 38 - for(int kk=0; kk<=nn; ++kk) 39 - CP_[nn].push_back( (kk?CP_[nn-1][kk-1]:0) + (kk<nn?CP_[nn-1][kk]:0) ); 33 + while( CP_.size() <= n ) { 34 + int nn = CP_.size(); 35 + CP_.push_back(vector<mint>(nn+1,1)); 36 + for(int kk=1; kk<nn; ++kk) 37 + CP_[nn][kk] = CP_[nn-1][kk-1] + CP_[nn-1][kk]; 40 38 } 41 39 return k<0 || n<k ? 0 : CP_[n][k]; 42 40 } 43 - 44 - 45 41 46 42 /* 47 43 // MODVAL must be a prime!! 48 44 LL GSS(LL k, LL b, LL e) // k^b + k^b+1 + ... + k^e 49 45 { 50 46 if( b > e ) return 0; 51 47 if( k <= 1 ) return k*(e-b+1);