编辑代码

import java.util.Scanner;
// 1:无需package
// 2: 类名必须Main, 不可修改

public class Main {
    static int ans = 0;
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int i = 0;
        int j = 0;
        dfs(i,j);
        System.out.println(ans);
        scan.close();
    }
    private static int dfs(int i,int j)
    {
        if(i==3||j==4)
        {
            return ans = ans + 1;
        }
        else
        {
            return dfs(i+1,j)+dfs(i,j+1);
        }
    }
}