Cod sursa(job #3367421)

Utilizator Octavian09Dore Octaviam Octavian09 Data 7 octombrie 2026 18:57:32
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <iostream>
#include <fstream>

using namespace std;
const int MOD = 666013;

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

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

void multmat(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(i = 0; i < 2;i++)
        for(j = 0; j < 2; j++)
            a[i][j] = c[i][j] % MOD;
}

void puteremat(int p){
    while(p){
        if(p & 1)
            multmat(I, A);
        multmat(A, A);
        p >>= 1;
    }
}

int main()
{
    int k;
    f >> k;
    if(k <= 1) g << k;
    else{
        puteremat(k - 1);
        g << I[0][0];
    }
    f.close();
    g.close();
    return 0;
}