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<form action="/login" method="post">
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    <a name="dialog--signin__close" href="javascript:;">CLOSE</a>
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      <label class="material textbox"> Username <input name="uname" type="text" data-autofocus="">
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      <label class="material textbox"> Password <input name="password" type="password">
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Text Content

 1. 
 2. Home
 3. Problem Set
 4. Training
 5. Contest
 6. Discussion
 7. Record
 8. More

 1. Login
 2. Sign Up
 3. Language



想要免费创建一个属于自己的 OJ 吗？

新用户必读

Hydro 项目用户群（1085853538）

hydro.ac 用户群（1091497622）

给我们投食

Github Repo (AGPL 3.0)


推荐题库列表

浴谷 | 计算机科学教育新生态

深入浅出基础篇

测试题域

Codeforces

CCF 真题

USACO

一本通启蒙篇/入门/提高

BZOJ

SPOJ

UOJ

POJ

LOJ

AtCoder


CONTEST

 1. 11
    2024-5
    
    
    华为算法精英实战营第六期（HYDROOJ 镜像测试赛）
    
     * IOI
     * 1224 hour(s)
     * 263

 2. 10
    2023-6
    
    
    「SFCOI-2」SADNESS FAN CLUB ROUND 2
    
     * IOI
     * Rated
     * 4 hour(s)
     * 58

 3. 11
    2023-3
    
    
    「SFCOI-1」SADNESS FAN CLUB ROUND 1
    
     * IOI
     * Rated
     * 4 hour(s)
     * 67

 4. 9
    2022-4
    
    
    愚人节比赛
    
     * IOI
     * 48 hour(s)
     * 104

 5. 12
    2022-2
    
    
    「退群杯」3RD
    
     * ACM/ICPC
     * Rated
     * 5 hour(s)
     * 205

 * More >


TRAINING

 1.  977
     Enrolled
     
     
     新手村
     
     任何一个伟大的目标，都有一个微不足道的开始。
     
      * 8 sections, 38 problems
      * 

 2.  490
     Enrolled
     
     
     能力全面提升综合题单
     
     StudyingFather 的洛谷综合题单
     
      * 109 sections, 715 problems
      * 

 3.  66
     Enrolled
     
     
     NOIP 提高组 (NOIP-S)
     
     NOIP 提高组 (NOIP-S)
     
      * 11 sections, 60 problems
      * 

 4.  69
     Enrolled
     
     
     NOIP 普及组 (NOIP-J)
     
     NOIP 普及组 (NOIP-J)
     
      * 2 sections, 8 problems
      * 

 5.  656
     Enrolled
     
     
     BZOJ 全面强化训练题单
     
     因为 pid > 4894 的题目存在缺失，所以再搞题单的时候就去除了原题单中题号大于 4894
     的题目，然后顺便敲了几个题号补上（一个算法中如果只有一道题还是100打头就是乱加的，因为每一块不能没有题目）。
     如果大家有遇到对应算法好的题目欢迎找我添加。
     
      * 96 sections, 514 problems
      * 

 6.  41
     Enrolled
     
     
     基础语法训练
     
     主要是针对零基础的同学，题目数量较少，难度较低。目的是简单了解C++基础语法的应用。
     
      * 2 sections, 3 problems
      * 

 7.  55
     Enrolled
     
     
     提高历练地
     
     已经去除了普及组难度的，请组织放心。成长大牛之必写题！！！
     
      * 22 sections, 108 problems
      * 

 8.  40
     Enrolled
     
     
     省选斗兽场/NOI神殿
     
     为省选及以上选手制作的训练场。其实，省选水平的oier不需要一些外加的刷题列表，本栏仅供参考，也欢迎各位指出不足。
     
      * 24 sections, 121 problems
      * 

 9.  60
     Enrolled
     
     
     USACO
     
     美国经典的算法练习题库，值得一刷
     
      * 22 sections, 83 problems
      * 

 10. 61
     Enrolled
     
     
     J到S的阴暗爬行
     
     CSP-J 到 CSP-S之路
     
      * 11 sections, 296 problems
      * 

 * More >


RANKING

Rank Username RP Bio

1 liujiameng 424 BZOJ 待处理帖子： -
https://hydro.ac/d/bzoj/discuss/662849e33ffdbb8... 2 baoshuo MOD 395
学习，就是发现自己越来越菜的过程。 || 个人主页 [Blog](https... 3 Macesuted QWQ SU 395 About Me [My
Code Reposito... 4 undefined 可爱！ SU 375 2021-9-19 记 >
我到现在都没有自己的博客站，之前wp，hexo，typecho都用过，然后发现————原来我根... 5 Maplisky 枫 369 AFOed | 退...
6 Che_001 351 7 Liking_Cpp_In_Luogu 346 A Liking_Cpp OIer 8 NetherDevil 316 NO
LONGER AN OIER. 9 wheneveright 311 PB24511952 ＮＥＶＥＲ！ＧＩＶＥＳ！ＵＰ！ 10 寒鸽儿 MOD 309
寒鸽儿咕咕咕

 * More >


DISCUSSION

 1.  5
     Comments
     
     
     HYDROOJ MARKDOWN & LATEX 完全指南
     
      * Hydro
      * 238 views
      * Rosmarinus @ 2 months ago

 2.  41
     Comments
     
     
     HYDROOJ 每日一题
     
      * HydroOJ
      * 6960 views
      * Macesuted @ 1 day ago

 3.  41
     Comments
     
     
     【站务】【新用户必读】站务整合帖
     
      * HydroOJ
      * 10319 views
      * Rosmarinus @ 10 months ago

 4.  1
     Comments
     
     
     "插件" 功能被弃用了?
     
      * Hydro
      * 6 views
      * Calustan @ 6 hours ago

 5.  5
     Comments
     
     
     上接两个帖子
     
      * Hydro
      * 6 views
      * liukejie2021 @ 11 minutes ago

 6.  0
     Comments
     
     
     HYDRO 是在更新吗？？？
     
      * Hydro
      * 8 views
      * liukejie2021 @ 9 hours ago

 7.  0
     Comments
     
     
     求助TARJAN模板
     
      * 分享
      * 4 views
      * wuyiming1263 @ 10 hours ago

 8.  0
     Comments
     
     
     HYDRO-CCF/BZOJ 导航帖
     
      * Hydro
      * 15 views
      * undefined @ 23 hours ago

 9.  0
     Comments
     
     
     为什么CF的题都没有汉化啊
     
      * Hydro
      * 43 views
      * 李奕樊 @ 1 week ago

 10. 0
     Comments
     
     
     IDE的默认字体大小怎么改啊
     
      * 分享
      * 35 views
      * suzakudry @ 1 week ago

 11. 1
     Comments
     
     
     HYDRO美化插件附件-谷歌插件下载方法
     
      * 分享
      * 74 views
      * 王晨皓 @ 5 days ago

 12. 8
     Comments
     
     
     外站题，求助在线等，挺急的
     
      * Hydro
      * 45 views
      * EddieHydro @ 1 week ago

 13. 0
     Comments
     
     
     85分，AC不了，帮帮孩子吧
     
      * [Ynoi2015] 此时此刻的光辉
      * 12 views
      * TheSecondDream @ 2 weeks ago

 14. 0
     Comments
     
     
     几个离谱BUG
     
      * 分享
      * 76 views
      * 栩子 @ 2 weeks ago

 15. 1
     Comments
     
     
     一些减秒技巧
     
      * 编程
      * 84 views
      * wzjDream @ 1 week ago

 16. 1
     Comments
     
     
     谁知道主页里怎么添加“你是第几个看我的人”啊？
     
      * Hydro
      * 97 views
      * lihouze @ 2 weeks ago

 17. 0
     Comments
     
     
     0分求助！！！！！
     
      * 分享
      * 26 views
      * wzjDream @ 3 weeks ago

 18. 0
     Comments
     
     
     如何添加数学公式
     
      * 分享
      * 33 views
      * lihouze @ 3 weeks ago

 19. 0
     Comments
     
     
     哪位好心人帮我调一下啊
     
      * 月下“毛景树”
      * 4 views
      * The_8th_Horcrux @ 3 weeks ago

 20. 0
     Comments
     
     
     站外题求解
     
      * 问答
      * 24 views
      * 楠楠瓜qwq @ 3 weeks ago

 * More >


RECENT PROBLEMS

[ROIR 2018 Day2] 大数据处理 1 week ago

[ROIR 2018 Day2] 分形 1 week ago

[ROIR 2018 Day2] 书页 1 week ago

[ROIR 2018 Day2] 删除数字 1 week ago

[ROIR 2018 Day1] 管道监控 1 week ago

[ROIR 2018 Day1] 电梯 1 week ago

[ROIR 2018 Day1] 平方与立方 1 week ago

[ROIR 2018 Day1] 提高成绩 1 week ago

【模板】基于值域预处理的快速离散对数 1 week ago

[GESP202409 四级] 区间排序 1 week ago


DISCUSSION NODES


 * 泛
   
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   4.  Go
   5.  Java
   6.  PHP
   7.  Python
   8.  Rust
   9.  保送
   10. 数学
   11. 编程


 * HYDRO
   
   1. Hydro
   2. 团队
   3. 建议
   4. 月赛


 * 探索
   
   1. 分享
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   3. 题解


RECOMMENDED


 * CHINESE
   
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 * ENGLISH
   
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   3. CodeChef
   4. SPOJ
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 * TOOLS
   
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