Cod sursa(job #2716148)

Utilizator victor1306Victor Mihaila victor1306 Data 4 martie 2021 19:20:08
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <fstream>

using namespace std;

ifstream cin ("kfib.in");
ofstream cout ("kfib.out");
long long f[2][2], a[2][2];
const int mod=666013;
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]%mod)*(b[k][j]%mod))%mod;
                aux[i][j]%=mod;
            }
        }
    }
    for(int i=0;i<2;i++){
        for(int j=0;j<2;j++){
            p[i][j]=aux[i][j];
        }
    }

}
int main()
{
    int n;
    cin>>n;
    f[0][0]=1;
    f[1][1]=1;
    a[0][0]=1;
    a[0][1]=1;
    a[1][0]=1;
    a[1][1]=0;
    while(n>0)
    {
        if(n%2!=0)
        {
            produs(f,f,a);
        }
        produs(a,a,a);
        n/=2;
    }
    cout<<f[1][0];
    return 0;
}