Cod sursa(job #3235033)

Utilizator Mihai_OctMihai Octavian Mihai_Oct Data 13 iunie 2024 17:11:10
Problema Al k-lea termen Fibonacci Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.79 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("kfib.in");
ofstream fout("kfib.out");
const int mod = 666013;
long long rasp[2][2] = {{1, 0}, {0, 1}};
long long fibo[2][2] = {{0, 1}, {1, 1}};
long long k;

static inline void Prod(long long a[2][2], long long b[2][2]) {
    long long c[2][2] = {{0, 0}, {0, 0}};
    for(int i : {0, 1}) {
        for(int j : {0, 1}) {
            for(int k : {0, 1}) c[i][j] += a[i][k] * b[k][j];
        }
    }
    for(int i : {0, 1}) {
        for(int j : {0, 1}) a[i][j] = c[i][j] % mod;
    }
}

static inline void Put(long long k) {
    while(k) {
        if(k & 1) Prod(rasp, fibo);
        Prod(fibo, fibo);
        k >>= 1;
    }
}

int main() {
    fin >> k;
    Put(k - 1);
    fout << rasp[1][1];

    return 0;
}