标签:scan freopen char clu blog 数列 matrix scanf fclose
定义f(x)为斐波那契数列第x项
输出f(f(x))%1000000007;
x<=10^100;
思路:
矩阵快速幂+各种神奇的模;
来,上代码:
#include <cmath> #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> #define mod 1000000007LL #define mod2 2000000016LL #define mod3 6000000048LL using namespace std; struct MatrixType { long long c[3][3]; }; long long dis[95]; char Cget; inline void in(long long &now) { now=0,Cget=getchar(); while(Cget>‘9‘||Cget<‘0‘) Cget=getchar(); while(Cget>=‘0‘&&Cget<=‘9‘) { now=now*10+Cget-‘0‘; Cget=getchar(); } } long long f1(long long mi) { long long now=1; struct MatrixType res,mul; // mul.sta(),res.st(); mul.c[1][1]=mul.c[1][2]=mul.c[2][1]=res.c[1][2]=1; mul.c[2][2]=res.c[1][1]=res.c[2][1]=res.c[2][2]=0; while(now<=mi) { if(now&mi) { struct MatrixType pos; pos.c[1][1]=0; pos.c[1][2]=0; pos.c[2][2]=0; pos.c[2][1]=0; for(int i=1;i<=2;i++) { for(int j=1;j<=2;j++) { for(int v=1;v<=2;v++) { pos.c[i][j]=(pos.c[i][j]+res.c[i][v]*mul.c[v][j]%mod2)%mod2; } } } res=pos; } struct MatrixType poxs; poxs.c[1][1]=0; poxs.c[1][2]=0; poxs.c[2][2]=0; poxs.c[2][1]=0; for(int i=1;i<=2;i++) { for(int j=1;j<=2;j++) { for(int v=1;v<=2;v++) { poxs.c[i][j]=(poxs.c[i][j]+mul.c[i][v]*mul.c[v][j]%mod2)%mod2; } } } mul=poxs,now<<=1; } return res.c[1][1]; } long long f(long long mi) { long long now=1; struct MatrixType res,mul; // mul.sta(),res.st(); mul.c[1][1]=mul.c[1][2]=mul.c[2][1]=res.c[1][2]=1; mul.c[2][2]=res.c[1][1]=res.c[2][1]=res.c[2][2]=0; while(now<=mi) { if(now&mi) { struct MatrixType pos; pos.c[1][1]=0; pos.c[1][2]=0; pos.c[2][2]=0; pos.c[2][1]=0; for(int i=1;i<=2;i++) { for(int j=1;j<=2;j++) { for(int v=1;v<=2;v++) { pos.c[i][j]=(pos.c[i][j]+res.c[i][v]*mul.c[v][j]%mod)%mod; } } } res=pos; } struct MatrixType poxs; poxs.c[1][1]=0; poxs.c[1][2]=0; poxs.c[2][2]=0; poxs.c[2][1]=0; for(int i=1;i<=2;i++) { for(int j=1;j<=2;j++) { for(int v=1;v<=2;v++) { poxs.c[i][j]=(poxs.c[i][j]+mul.c[i][v]*mul.c[v][j]%mod)%mod; } } } mul=poxs,now<<=1; } return res.c[1][1]; } int main() { freopen("na.in","r",stdin); freopen("na.out","w",stdout); long long t,len; in(t);char ch[401]; // dis[1]=1; // for(int i=2;i<=90;i++) dis[i]=dis[i-1]+dis[i-2]; while(t--) { long long x=0; scanf("%s",ch),len=strlen(ch); for(int i=len-1;i>=0;i--) x=(x*10+ch[i]-‘0‘)%mod3; cout<<f(f1(x))%mod<<endl; } fclose(stdin),fclose(stdout); return 0; }
标签:scan freopen char clu blog 数列 matrix scanf fclose
原文地址:http://www.cnblogs.com/IUUUUUUUskyyy/p/6670650.html