Cod sursa(job #3245745)

Utilizator andreea0146Nicula Andreea andreea0146 Data 30 septembrie 2024 15:38:57
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <fstream>
using namespace std;
const int MOD=666013;

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

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;
    fin>>k;
    if(k<=1) fout<<k;
    else
    {
        puteremat(k-1);
        fout<<i[0][0];
    }

    fin.close();
    fout.close();
    return 0;
}