Cod sursa(job #2716185)

Utilizator valeriucaraselCarasel Valeriu valeriucarasel Data 4 martie 2021 19:56:11
Problema Al k-lea termen Fibonacci Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include <iostream>
#include <fstream>

using namespace std;

long long f[2][2],a[2][2];

void produs(long long p[2][2],long long a[2][2],long long b[2][2])
{
    int aux[2][2];
    for (int i=0;i<2;i++)
    {
        for (int j=0;j<2;j++)
        {
            aux[i][j]=0;
            for (int k=0;k<2;k++)
            {
                aux[i][j]+=a[i][k]*b[k][j];
                aux[i][j]%=666013;
            }
        }
    }
    for (int i=0;i<2;i++)
    {
        for (int j=0;j<2;j++)
        {
            p[i][j]=aux[i][j];
        }
    }
}


int main()
{
    ifstream in("kfib.in");
    ofstream out("kfib.out");
    long long K,n;
    in>>K;
    n=K;

    a[0][0]=1; a[0][1]=1; a[1][0]=1; a[1][1]=0;
    f[0][0]=1; f[0][1]=0; f[1][0]=0; f[1][1]=1;

    while (K>0)
    {
        if(K%2!=0)
        {
            produs(f,f,a);
      int f[2][2],a[2][2];  }
        produs(a,a,a);
        K=K/2;
    }
    if (n>2)
        out<<f[1][0];
    else
    if (n==0)
        out<<0;
    else
        out<<1;
    in.close();
    out.close();
    return 0;
}