Cod sursa(job #2949017)

Utilizator staicumateiStaicu Matei Octavian staicumatei Data 29 noiembrie 2022 11:46:46
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include <bits/stdc++.h>

using namespace std;

const int mod=666013;

void prod(int p[2][2],int a[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]=aux[i][j]+(long long)p[i][k]*a[k][j]%mod;
                aux[i][j]=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 fibo(int n)
{
    int a[2][2]={{1,1},{1,0}};
    int p[2][2]={{1,0},{0,1}};
    n--;
    while(n)
    {
        int nrr=n%2;
        if(nrr)
        {
            prod(p,a);
        }
        prod(a,a);
        n=n/2;
    }
    return p[0][0];
}
int main()
{
    ifstream f("kfib.in");
    ofstream g("kfib.out");
    int k;
    f>>k;
    g<<fibo(k);
    return 0;
}