Cod sursa(job #2698841)

Utilizator darisavuSavu Daria darisavu Data 23 ianuarie 2021 10:23:52
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include <bits/stdc++.h>
#define ll long long
#define mod 666013
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
ll a[2][2]={{0,1},{0,0}};
ll c[2][2]={{0,1},{1,1}};
ll sol[2][2]={{1,0},{0,1}};
int n;
void inmult(ll a[2][2],ll b[2][2])
{
    ll c[2][2];
    int i,j,k;
    for(i=0;i<=1;i++)
    {
        for(j=0;j<=1;j++)
        {
            c[i][j]=0;
            for(k=0;k<=1;k++)
            {
                c[i][j]+=a[i][k]*b[k][j];
                c[i][j]%=mod;
            }
        }
    }
    for(i=0;i<=1;i++)
        for(j=0;j<=1;j++) a[i][j]=c[i][j];
}
void putere(ll sol[2][2],int k)
{
    while(k)
    {
        if(k%2==1)
        {
            inmult(sol,c);
            k--;
        }
        else
        {
            inmult(c,c);
            k/=2;
        }
    }
}
int main()
{
    f>>n;
    putere(sol,n);
    inmult(a,sol);
    g<<a[0][0];
    return 0;
}