Cod sursa(job #3318053)

Utilizator Warrior.exeZgorcea Mihai-Alexandru Warrior.exe Data 26 octombrie 2025 19:11:24
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;

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;
}