Cod sursa(job #3231110)

Utilizator BogdanBurescuBogdan Burescu BogdanBurescu Data 24 mai 2024 20:58:36
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.07 kb
#include <fstream>

using namespace std;

ifstream cin("kfib.in");
ofstream cout("kfib.out");

long long p,ans[1][2],m[2][2],MOD=666013;

void inmultire(long long a[2][2],long long b[2][2])
{

    long long c[2][2];
    for(int i=0;i<=1;i++)
        for(int j=0;j<=1;j++)
        {
            c[i][j]=0;
            for(int k=0;k<=1;k++)
                c[i][j]=(c[i][j]+1LL*a[i][k]*b[k][j])%MOD;
        }
    for(int i=0;i<=1;i++)
        for(int j=0;j<=1;j++)
            a[i][j]=c[i][j];
}
void inmultire2(long long rez[1][2],long long a[2][2])
{
    long long c[1][2];
    int i=0;
    for(int j=0;j<=1;j++)
    {
        c[i][j]=0;
        for(int k=0;k<=1;k++)
            c[i][j]=(c[i][j]+1LL*rez[i][k]*a[k][j])%MOD;
    }
    i=0;
    for(int j=0;j<=1;j++)
        rez[i][j]=c[i][j];
}
int main(void)
{
    ans[0][1]=1;
    m[0][1]=1;
    m[1][0]=1;
    m[1][1]=1;
    cin>>p;
    while(p)
    {
        if(p%2==1)
            inmultire2(ans,m);
        inmultire(m,m);
        p=p/2;
    }
    cout<<ans[0][0];
    return 0;
}