Cod sursa(job #2143420)

Utilizator andrei13Paval Andrei andrei13 Data 25 februarie 2018 22:09:27
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.01 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
long long k;
long long z[3][3];
void prod(long long a[3][3],long long b[3][3],long long c[3][3])
{
    for(int i=1;i<=2;++i)
    for(int j=1;j<=2;++j)
    {
        long long s=0;
        for(int k=1;k<=2;++k)
            s+=(a[i][k]*b[k][j])%666013;
        c[i][j]=s%666013;
    }
}
void power(long long p,long long z[3][3],long long sol[3][3])
{
    if(p>1)
    {
        if(!(p%2))
        {
            long long aux[3][3];
            power(p/2,z,aux);
            prod(aux,aux,sol);
        }
        else {
            long long aux[3][3];
            power(p-1,z,aux);
            prod(z,aux,sol);
        }
    }
    else
    {
        for(int i=1;i<=2;++i)
            for(int j=1;j<=2;++j)
              sol[i][j]=z[i][j];
    }
}
int main()
{f>>k;
 z[1][1]=0;
 z[1][2]=z[2][1]=z[2][2]=1;
 long long sol[3][3];
 power(k-1,z,sol);
 g<<sol[2][2];
    return 0;
}