Cod sursa(job #2917714)

Utilizator Gica-gicutaGeorge Gica-gicuta Data 7 august 2022 13:03:54
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.43 kb
#include <fstream>
#define MOD 666013
#define N 3
using namespace std;
ifstream cin("kfib.in");
ofstream cout("kfib.out");
long long mat[N][N];
long long matc[N][N];
long long mati[N][N];
void inmultire(long long mat[][N],long long matt[][N],long long matf[][N],long long n,long long m,long long p)
{
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++)
            matf[i][j]=0;
    for(long long i=1; i<=n; i++)
    {
        for(long long j=1; j<=m; j++)
        {
            for(long long l=1; l<=p; l++)
            {
                matf[i][j]+=mat[i][l]*matt[l][j];
                matf[i][j]%=MOD;
            }
        }
    }
}
void atribuire(long long mat1[][N],long long mat2[][N],long long n,long long m)
{
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++)
        {
            mat1[i][j]=mat2[i][j];
        }
    }
}
int main()
{
    mati[1][1]=1;
    mati[1][2]=1;
    mati[2][1]=1;
    mati[2][2]=0;
    ///
    mat[1][1]=1;
    mat[1][2]=1;
    mat[2][1]=1;
    mat[2][2]=0;
    long long n;
    cin>>n;
    n--;
    while(n>0)
    {
        if(n%2==1)
        {
            inmultire(mati,mat,matc,2,2,2);
            atribuire(mati,matc,2,2);
            n--;
        }
        else
        {
            inmultire(mat,mat,matc,2,2,2);
            atribuire(mat,matc,2,2);
            n/=2;
        }
    }
    cout<<mati[2][1]%MOD;
    return 0;
}