Cod sursa(job #2694998)

Utilizator Marius2003Ciochina Marius Marius2003 Data 11 ianuarie 2021 14:03:40
Problema Al k-lea termen Fibonacci Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.97 kb
#include <iostream>
#include <fstream>

using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");

const int MOD=666013,
            P=1332028;

int A[2][2]={{1,1},{1,0}},
    I[2][2]={{1,0},{0,1}};

void multmat(int a[][2],int b[][2])
{
    int c[2][2];
    for(int i=0;i<2;i++)
        for(int j=0;j<2;j++)
        {
            c[i][j]=0;
            for(int k=0;k<2;k++)
            c[i][j]=(c[i][j]+1LLa[i][k]b[k][j])%MOD;
        }
    ///memcpy(a,c,sizeof(c));///a <-- c
            ///sau
    for(int i=0;i<2;i++)
        for(int j=0;j<2;j++)
            a[i][j]=c[i][j];
}

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];
    }
    return 0;
}