标签:style blog http color io os ar for sp
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Case #1: 2 Case #2: 818503
#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <string> #include <map> #include <stack> #include <vector> #include <set> #include <queue> #define maxn 205 #define MAXN 200005 #define INF 0x3f3f3f3f #define mod 20140518 #define eps 1e-6 const double pi=acos(-1.0); typedef long long ll; using namespace std; ll n,k,ans; struct Matrix { int row,col; ll v[15][15]; Matrix operator*(Matrix &tt) { int i,j,k; Matrix temp; temp.row=row; temp.col=tt.col; for(i=1; i<=row; i++) for(j=1; j<=tt.col; j++) { temp.v[i][j]=0; for(k=1; k<=col; k++) { temp.v[i][j]+=v[i][k]*tt.v[k][j]; temp.v[i][j]%=mod; } } return temp; } }; Matrix pow_mod(Matrix x,ll i) // x^i { Matrix tmp; tmp.row=x.row; tmp.col=x.col; memset(tmp.v,0,sizeof(tmp.v)); for(int j=1;j<=x.row;j++) tmp.v[j][j]=1; while(i) { if(i&1) tmp=tmp*x; x=x*x; i>>=1; } return tmp; } void solve() { int i,j; Matrix A,res,x; x.row=1; x.col=k; res.row=1; res.col=k; memset(x.v,0,sizeof(x.v)); x.v[1][1]=k+1; A.row=A.col=k; memset(A.v,0,sizeof(A.v)); for(i=1;i<=k;i++) { A.v[i-1][i]=k-i+2; for(j=i;j<=k;j++) { A.v[j][i]=1; } } res=pow_mod(A,n-1); res=x*res; ans=0; for(i=1;i<=k;i++) { ans+=res.v[1][i]; ans%=mod; } } int main() { int i,j,test,ca=0; scanf("%d",&test); while(test--) { scanf("%lld%lld",&n,&k); solve(); printf("Case #%d: %lld\n",++ca,ans); } return 0; }
bnu oj 34985 Elegant String (矩阵+dp)
标签:style blog http color io os ar for sp
原文地址:http://blog.csdn.net/tobewhatyouwanttobe/article/details/39697215