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题解 | 查看不同年龄段的用户明细

select device_id,gender, case when age<20 then '20岁以下' when age>=20 and age<=24 then '20-24岁' when age>=25 then '25岁及以上' when age is null ...

2026-02-09

0 66

题解 | 统计每个用户的平均刷题数

select up.university,qd.difficult_level,round(count(qpd.device_id)/count(distinct(qpd.device_id)),4) as avg_answer_cnt from user_profile up inner join...

2026-02-09

0 52

题解 | 统计每个学校各难度的用户平均刷题数

select up.university,qd.difficult_level, round(count(qpd.device_id)/count(distinct(qpd.device_id)),4) as avg_answer_cnt from user_profile up inner joi...

2026-02-09

0 56

题解 | 判断一个链表是否为回文结构

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-08

0 56

题解 | 链表相交

import java.util.*; public class Main { public static class ListNode { int val; ListNode next; ListNode(int x) { ...

2026-02-07

0 34

题解 | 合并两个排序的链表

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-07

0 42

题解 | 序列链表化

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-07

0 40

题解 | 链表序列化

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-07

0 38

题解 | 反转链表

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-07

0 33

题解 | 移除链表元素

import java.util.*; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(int val) { * this.val = val; * ...

2026-02-07

0 42