````language`

#include<iostream>
using namespace std;
int gay(int day){
	if(day==10){
		return 1;
	}else{
		return (gay(day+1)+1)*2;
	}
}
int main(){
	cout<<"一共有"<<gay(0)<<"个果子"; 
	return 0;
}

````language`

#include<iostream>
using namespace std;
int akm(int m,int n){
	if(m==0) return n+1;
	else if(m>0&&n==0) return akm(m-1,1);
	else
		return akm(m-1,akm(m,n-1));
}
int main(){
	int m,n;
	cin>>m,n;
	cout<<akm(m,n);
	return 0;
}

````language`

#include<iostream>
using namespace std;
int akm(int m,int n){
	if(m==0) return n+1;
	else if(m>0&&n==0) return akm(m-1,1);
	else
		return akm(m-1,akm(m,n-1));
}
int main(){
	return 0;
}

````language`

#include<iostream>
using namespace std;
int fun(int n){
	if(n==0||n==1){
		return 1;
	}else{
		return fun(n-1)+fun(n-2);
	}
}
int main(){
	int m;
	cin>>m;
	cout<<fun(fun(m))<<endl;
	return 0;
}

#include<iostream>
using namespace std;
int reverse(int n){
	if(n<10) return n;
	else{
		cout<<n%10;
		return reverse(n/10);
	}
}
int main(){
	int n;
	cin>>n;
	cout<<reverse(n);
	return 0;
}

#include<iostream>
using namespace std;
int reverse(int n){
	if(n<10) return n;
	else{
		cout<<n%10;
		return reverse(n/10);
	}
}
int main(){
	int n;
	cin>>n;
	cout<<reverse(n);
	return 0;
}

````language`

#include<iostream>
using namespace std;
int reverse(int n){
	if(n<10) return n;
	else{
		cout<<n%10;
		return reverse(n/10);
	}
}
int main(){
	int n;
	cin>>n;
	cout<<reverse(n);
	return 0;
}

````language`

#include<iostream>
using namespace std;
int countBooks(int student){
	if(student==1){
		return 4;
	}else{
		return countBooks(student-1)+3;
	}
}
int main(){
	cout<<countBooks(4);
	return 0;
}

58

?!肥肥！？

#include <cmath>
using namespace std;
bool isPrime(int x)
{
    if (x < 2)
        return false;
    for (int i = 2; i <= sqrt(x); i++)
    {
        if (x % i == 0)
            return false;
    }
    return true;
}

int main()
{
    int n;
    cin >> n;
    int count = 0;   
    int number = 2;  

    while (true)
    {
        if (isPrime(number))
        {
            count++;
            if (count == n)
            {
                cout << number;
                break;
            }
        }
        number++;
    }
    return 0;
}

````language`

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

````language`

#include<iostream>
using namespace std;
int fac(int n){
	if(n==1) return 1;
	else return n*fac(n-1);
} 
int main(){
	int n;
	cin>>n;
	cout<<fac(n)<<endl;
}