GPT 3.5发的题解

#include <iostream>
using namespace std;

int fibonacci(int n) {
    if (n == 1 || n == 2) return 1;
    return fibonacci(n - 1) + fibonacci(n - 2);
}

int main() {
    int n;
    cin >> n;
    cout << fibonacci(n);
    return 0;
}