Cod sursa(job #3309428)

Utilizator LucaWalucaLuca Munteanu LucaWaluca Data 4 septembrie 2025 15:43:19
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 in("kfib.in");
ofstream out("kfib.out");
const int MOD = 666013;
int n;
int sol[2][2];
int mat[2][2];
void imlt(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]+=(1ll*a[i][k]*b[k][j])%MOD;
                c[i][j]%=MOD;
            }
        }
    }
    for (int i=0;i<2;i++)
    {
        for (int j=0;j<2;j++)
            a[i][j]=c[i][j];
    }
}
int main()
{
    in>>n;
    mat[0][0]=0;
    mat[0][1]=1;
    mat[1][0]=1;
    mat[1][1]=1;
    sol[0][0]=0;
    sol[1][0]=0;
    sol[1][1]=0;
    sol[0][1]=1;
    while(n)
    {
        if(n&1)
            imlt(sol,mat);
        imlt(mat,mat);
        n/=2;
    }
    out<<sol[0][0];
}