Cod sursa(job #3123734)

Utilizator Horia123144Musat Horia Gabriel Horia123144 Data 25 aprilie 2023 10:19:01
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.07 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
void inmultire(long long a[2][2], long long b[2][2], long long c[2][2])
{
    for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
        {
            c[i][j]=0;
            for(int k=0; k<=1; k++)
            {
                c[i][j]+=a[i][k]*b[k][j];
                c[i][j]%=666013;
            }
        }
}
void copiere(long long a[2][2], long long b[2][2])///copiez pe b in a
{
    for(int i=0; i<=1; i++)
        for(int j=0; j<=1; j++)
            a[i][j]=b[i][j];
}
int n;
long long a[2][2]={ {1,1},
                    {1,0}};
 long long p[2][2]={ {1,0},
                     {0,1}};
long long b[2][2];
int main(){
    f>>n;
    if(n<=2)
    {
        g<<1;
        return 0;
    }
    n-=2;
    while(n)
    {
        if(n%2==1)
        {
            inmultire(p,a,b);
            copiere(p,b);
        }
        inmultire(a,a,b);
        copiere(a,b);
        n/=2;
    }
    g<<(p[0][0]+p[0][1])%666013;
    return 0;
}