Cod sursa(job #3355662)

Utilizator g.darius07Gheorghe Darius Nicolae g.darius07 Data 24 mai 2026 16:54:07
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <fstream>
using namespace std;
const int MOD = 666013;

int a[2][2] = {{1, 1}, {1, 0}};
int i[2][2] = {{1, 0}, {0, 1}};

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

void multmat(int a[][2], int b[][2]) {
    long long c[2][2];
    int i, j, k;
    for(i = 0; i < 2; i++)
        for(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 % 2)
            multmat(i, a);
        multmat(a, a);
        p /= 2;
    }
}

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;
}