câu 1

#include <iostream>
using namespace std;

int fibonacci(int n) {
    if (n < 0) {
        return -1;
    }
    if (n <= 1) {
        return n;
    }
    else return fibonacci(n - 1) + fibonacci(n - 2);
}
int main ()
{
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cout << fibonacci(i) << " ";
    }
    return 0;
}