Cod sursa(job #3192617)

Utilizator Giulian617Buzatu Giulian Giulian617 Data 13 ianuarie 2024 01:36:33
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.86 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
const int MOD=666013;
int n,a[2][2],ans[2][2];
void initialization()
{
    a[0][0]=0;
    a[0][1]=a[1][0]=a[1][1]=1;
    ans[1][0]=ans[1][1]=0;
    ans[0][0]=ans[0][1]=1;
}
void multiplication(int a[2][2],int b[2][2])
{
    int c[2][2]= {};
    for(int i=0; i<2; i++)
        for(int j=0; j<2; j++)
            for(int k=0; k<2; k++)
                c[i][j]=(c[i][j]+(1LL*a[i][k]*b[k][j])%MOD)%MOD;
    for(int i=0; i<2; i++)
        for(int j=0; j<2; j++)
            a[i][j]=c[i][j];
}
void fast_exp(int power)
{
    while(power)
    {
        if(power%2)
            multiplication(ans,a);
        multiplication(a,a);
        power/=2;
    }
}
int main()
{
    f>>n;
    initialization();
    fast_exp(n-1);
    g<<ans[0][0];
    return 0;
}