题解 | #放苹果#

import java.util.*;

public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int app = sc.nextInt();
        int dis = sc.nextInt();
        System.out.println(dfs(app,dis));
    }
    public static int dfs(int n, int m){
        if(n ==0 || m ==1){
            return 1;
        }
        if(m > n){
            return dfs(n,n);
        }
        return dfs(n,m-1)+dfs(n-m,m);
    }
}