Cod sursa(job #3131743)

Utilizator AlexanderCernyCernaianu Alexandru AlexanderCerny Data 21 mai 2023 10:58:02
Problema Al k-lea termen Fibonacci Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.78 kb
#include <fstream>
#define mod 666013

using namespace std;

ifstream fin ("kfib.in");
ofstream fout("kfib.out");

int k;
long long a[3][3]={{0,0,0},{0,0,1},{0,1,1}};
long long p[3][3]={{0,0,0},{0,1,0},{0,0,1}};
long long c[3][3];
void inmultire(long long a[][3],long long b[][3],long long c[][3])
{
    for(int i=1;i<=2;i++)
        for(int j=1;j<=2;j++)
        {
            c[i][j]=0;
            for(int k=1;k<=2;k++)
                c[i][j]=(c[i][j]+(a[i][k]*b[k][j])%mod)%mod;
        }
    for(int i=1;i<=2;i++)
        for(int j=1;j<=2;j++)
            a[i][j]=c[i][j];
}
int main()
{
    fin>>k;
    while(k)
    {
        if(k%2!=0)
            inmultire(p,a,c);
        k=k/2;
        inmultire(a,a,c);
    }
    fout<<p[2][2];
    return 0;
}