Cod sursa(job #2635548)

Utilizator RTG123Razvan Diaconescu RTG123 Data 14 iulie 2020 19:04:53
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.28 kb
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
long long int x1=0,x2=1,rez,m[3][3],ult[3][3];
int n;
void exec (long long int a[3][3],long long int b[3][3],long long int rez[3][3])
{
    for (int i=0; i<2; i++)
    {
        for (int j=0; j<2; j++)
        {
            for (int z=0; z<2; z++)
            {
                rez[i][j]=(rez[i][j]+a[i][z]*b[z][j])%666013;
            }
        }
    }
}
void afis (long long int a[3][3])
{
    for (int i=0; i<2; i++)
    {
        for (int j=0; j<2; j++)
        {
            cout<<a[i][j]<<' ';
        }
        cout<<'\n';
    }
}
void pow (int exp,long long int rez[][3])
{
    long long int c[3][3],aux[3][3];
    memcpy(c,m,sizeof(m));
    rez[0][0]=rez[1][1]=1;
    for (int i=0; (1<<i)<=exp; i++)
    {
        if (exp & (1<<i))
        {
            memset(aux,0,sizeof(aux));
            exec(rez,c,aux);
            memcpy(rez,aux,sizeof(aux));
        }
        memset(aux,0,sizeof(aux));
        exec(c,c,aux);
        memcpy(c,aux,sizeof(c));
    }
}
int main()
{
    f>>n;
    m[0][0]=0;
    m[0][1]=1;
    m[1][0]=1;
    m[1][1]=1;
    pow(n-1,ult);
  //  afis(ult);
    g<<ult[1][1];
    return 0;
}