Cod sursa(job #2711453)

Utilizator Giulian617Buzatu Giulian Giulian617 Data 24 februarie 2021 09:43:52
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.81 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("kfib.in");
ofstream g("kfib.out");
const int MOD=666013;
int n,a[3][3],sol[3][3];
void initialization()
{
    a[0][0]=0;
    a[0][1]=a[1][0]=a[1][1]=1;
    sol[1][0]=sol[1][1]=0;
    sol[0][0]=sol[0][1]=1;
}
void multiplication(int a[3][3],int b[3][3])
{
    int ans[3][3];
    memset(ans,0,sizeof(ans));
    for(int i=0; i<2; i++)
        for(int j=0; j<2; j++)
            for(int k=0; k<2; k++)
                ans[i][j]=(ans[i][j]+1LL*a[i][k]*b[k][j])%MOD;
    memcpy(a,ans,sizeof(ans));
}
void solve(int p)
{
    while(p)
    {
        if(p%2)
            multiplication(sol,a);
        p/=2;
        multiplication(a,a);
    }
}
int main()
{
    f>>n;
    initialization();
    solve(n-1);
    g<<sol[0][0];
    return 0;
}