Cod sursa(job #3314259)

Utilizator alexbaldovin20alex baldovin alexbaldovin20 Data 9 octombrie 2025 09:24:29
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.78 kb
#include <bits/stdc++.h>
#define MOD 666013

using namespace std;

ifstream in("kfib.in");
ofstream out("kfib.out");

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

void mm(int a[][2], int b[][2])
{
    long long c[2][2];
    int i,j,k;
    for(int i=0;i<2;i++)
        for(int j=0;j<2;j++)
        {
            c[i][j]=0;
            for(k=0;k<2;k++)
                c[i][j]+=1LL*a[i][k]*b[k][j];
        }
    for(j=0;i<2;i++)
        for(j=0;j<2;j++)
            a[i][j]=c[i][j]%MOD;
}

void pm(int p)
{
    while(p)
    {
        if(p%2)
            mm(I,A);
        mm(A,A);
        p/=2;
    }
}

int main()
{
    int k;
    in>>k;
    if(k<=1)
        out<<k;
    else
    {
        pm(k-1);
        out<<I[0][0];
    }
    return 0;
}