Cod sursa(job #3260537)

Utilizator PetruApostolApostol Mihnea Petru PetruApostol Data 2 decembrie 2024 17:52:13
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.72 kb
#include <fstream>
using namespace std;

ifstream cin("kfib.in");
ofstream cout("kfib.out");

int a[2][2]={{0,1},{1,1}};
int b[2][2]={{1,0},{0,1}};

#define MOD 666013

void inm(int a[][2],int b[][2]){///printf("a");
    int i,j,k,aux[2][2];
    for(i=0;i<2;i++){
        for(j=0;j<2;j++){aux[i][j]=0;
            for(k=0;k<2;k++){
                aux[i][j]=(aux[i][j]+1ll*a[i][k]*b[k][j])%MOD;
            }
        }
    }
    for(i=0;i<2;i++)
        for(j=0;j<2;j++)
            a[i][j]=aux[i][j];
}

int main()
{
    int n;
    cin>>n;
    if(n<=2){cout<<"1";return 0;}
    n--;
    while(n){
        if(n%2) inm(b,a);

        inm(a,a);
        n/=2;
    }
    cout<<b[1][1];
    return 0;
}