Cod sursa(job #1157454)

Utilizator delta_wolfAndrei Stoica delta_wolf Data 28 martie 2014 15:40:37
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.95 kb
#include<cstdio>
#include<cstring>
#define mod 666013
using namespace std;
int n,i,m[3][3],r[3][3];
inline void inmat(int a[][3],int b[][3],int c[][3])
{
    int i,j,k;
    for(i=0;i<2;i++)
    {
        for(j=0;j<2;j++)
            for(k=0;k<2;k++)
                c[i][j]=(c[i][j]+1LL*a[i][k]*b[k][j])%mod;

    }
}
inline void fibo(int k,int s[][3])
{
    int i,c[3][3],x[3][3];
    memcpy(c,m,sizeof(m));
    s[0][0]=1;
    s[1][1]=1;
    for(i=0;(1<<i)<=k;i++)
    {
        if(k&(1<<i))
        {
            memset(x,0,sizeof(x));
            inmat(s,c,x);
            memcpy(s,x,sizeof(x));
        }
        memset(x,0,sizeof(x));
        inmat(c,c,x);
        memcpy(c,x,sizeof(x));
    }
}
int main()
{
    freopen("kfib.in","r",stdin);
    freopen("kfib.out","w",stdout);
    scanf("%d",&n);
    m[0][0]=0;
    m[0][1]=1;
    m[1][0]=1;
    m[1][1]=1;
    fibo(n-1,r);
    printf("%d",r[1][1]);
    return 0;
}