Cod sursa(job #3316767)

Utilizator Alexandra282Calin Maria Alexandra Alexandra282 Data 20 octombrie 2025 17:30:13
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
const int MOD=666013;
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]+=(long long)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;
    f>>k;
    if(k<=1)
        g<<k;
    else
    {
        puteremat(k-1);
        g<<I[0][0];
    }
    f.close();
    g.close();
    return 0;
}