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题解 | #最小的K个数#

import java.util.ArrayList; import java.lang.Math; import java.util.Arrays; public class Solution { public ArrayList GetLeastNumbers_Solution(int [] i...

Java

2021-12-16

0 246

题解 | #实现二叉树先序，中序和后序遍历#

import java.util.*; /* public class TreeNode { int val = 0; TreeNode left = null; TreeNode right = null; } */ public class Solution { /** * * @param...

Java

2021-12-16

0 288

题解 | #查找所有员工的last_name和first_name以及对应的dept_name#

select em.last_name,em.first_name,dep.dept_name from employees as em left join dept_emp as dm on em.emp_no = dm.emp_no left join departments as dep on...

Mysql

2021-12-16

0 312

题解 | #统计出当前各个title类型对应的员工当前薪水对应的平均工资#

select tt.title,avg(sal.salary) avg_sal from titles as tt left join salaries as sal on tt.emp_no = sal.emp_no group by tt.title order by avg_sal

Mysql

2021-12-16

0 253

题解 | #牛客的课程订单分析(一)#

select * from order_info where date > '2025-10-15' and status = 'completed' and (product_name = 'C++' or product_name = 'Python' or product_name = ...

Mysql

2021-12-16

0 336

题解 | #找到每个人的任务#

select p.id,p.name,t.content from person as p left join task as t on p.id = t.person_id order by p.id asc select p.id,p.name,t.content from person p l...

Mysql

2021-12-16

0 235

题解 | #字符串压缩#

import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.IOException; public class Main{ public static void main(String[] args)...

Java

2021-12-16

0 431

题解 | #数字序列第n位的值#

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Main{ public static void main(String[] args)...

Java

2021-12-16

0 398

题解 | #将满二叉树转换为求和树#

import java.util.; import java.io.; public class Main{ public static void main(String[] args)throws IOException{ BufferedReader in = new BufferedReade...

Java

2021-12-16

0 474

题解 | #微信红包#

import java.util.*; public class Gift { public int getValue(int[] gifts, int n) { int flag = 1; int num = gifts[0]; for(int i = 1;i < n;i++){ ...

Java

2021-12-16

0 583