Cod sursa(job #3242538)

Utilizator AndreiFlorea06Florea Andrei AndreiFlorea06 Data 12 septembrie 2024 16:15:27
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <fstream>

using namespace std;

ifstream f("kfib.in");
ofstream g("kfib.out");
const int MOD=666013;

int A[2][2]={{1,1},{1,0}};
int I[2][2]={{1,0},{0,1}};

void multmat(int a[][2],int b[][2])
{
    long long c[2][2];
    int i,j,k;
    for(i=0;i<2;i++)
        for(j=0;j<2;j++)
    {
        c[i][j]=0;
        for(k=0;k<2;k++)
            c[i][j]+=1LL*a[i][k]*b[k][j];

    }
    for(i=0;i<2;i++)
        for(j=0;j<2;j++)
            a[i][j]=c[i][j]%MOD;
}

void puteremat(int p)
{
    while(p>0)
        if(p%2==0)
    {
        multmat(A,A);
        p/=2;

    }
    else
    {
        multmat(I,A);
        p--;
    }
}

int main()
{
    int k;
    f>>k;
    if(k<=1)
        g<<k;
    else
    {
        puteremat(k-1);
        g<<I[0][0];
    }
    f.close();
    g.close();
}