程序员Realeo

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全部文章（共161篇）

题解 | #删除有序链表中重复的元素-I#

import java.util.*; import java.util.stream.Collectors; /* * public class ListNode { * int val; * ListNode next = null; * public ListNode(i...

2023-08-18

0 348

题解 | #单链表的排序#

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

2023-08-17

0 333

题解 | #删除链表的倒数第n个节点#

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

2023-08-15

0 354

题解 | #链表中倒数最后k个结点#

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

2023-08-10

0 343

题解 | #链表中环的入口结点#

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

2023-08-10

0 261

题解 | #合并k个已排序的链表#

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

2023-08-10

0 266

题解 | #链表中的节点每k个一组翻转#

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

2023-08-10

0 270

题解 | #用户首次登录后次3日内活跃天数#

select a.id, count(b.id) from user_visit_log a left join user_visit_log b on a.id = b.id and timestampdiff (day, a.visit_date, b.v...

2023-07-27

0 221

题解 | #分群并计算群体人数#

select age_group, count(age_group) as user_count from ( select case when age < 20 then '20以下' ...

2023-07-26

2 239

题解 | #查询职位发布时间在2021年后或职位城市为上海

select job_id,boss_id,company_id from job_info where job_city = '上海' union select job_id,boss_id,company_id from job_info where ...

2023-07-26

0 178