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Python 数据结构+算法 面试实战系列:字典

  • 2026-08-27 11:48:33
Python 数据结构+算法 面试实战系列:字典

Python 数据结构+算法 面试实战系列：字典

🔥Python字典只知道dict？难怪面试总被追问！
整理了Python字典4大实现方式+6道大厂高频面试题，从原理到实战一次讲透！

📌 核心知识点速览：
• 哈希表O(1)原理 & Compact Hash Table优化
• dict vs defaultdict vs OrderedDict vs MappingProxyType 选型指南
• LC560/49：defaultdict优雅解决计数分组
• LC380：dict+list实现O(1)随机操作（字节/美团常考）
• LC146：手撕LRU Cache（dict+双向链表经典组合）
• LC128：哈希集合O(n)最长连续序列

💡 笔记里放了最核心的代码片段和设计思路，完整可运行代码已共享在：
https://url11.ctfile.com/d/45455611-167845092-9e8e41?p=6872 (访问密码: 6872)

面试不是背题，是理解数据结构背后的权衡。
字典看似简单，但用对场景才能写出高质量代码！
#Python #算法题 #LeetCode #数据结构 #大厂面试

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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001143s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001828s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000674s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001160s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001326s ]
  6. SELECT * FROM `set` [ RunTime:0.006274s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001920s ]
  8. SELECT * FROM `article` WHERE `id` = 512334 LIMIT 1 [ RunTime:0.001265s ]
  9. UPDATE `article` SET `lasttime` = 1788006155 WHERE `id` = 512334 [ RunTime:0.013999s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000623s ]
  11. SELECT * FROM `article` WHERE `id` < 512334 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001257s ]
  12. SELECT * FROM `article` WHERE `id` > 512334 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001193s ]
  13. SELECT * FROM `article` WHERE `id` < 512334 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003637s ]
  14. SELECT * FROM `article` WHERE `id` < 512334 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004085s ]
  15. SELECT * FROM `article` WHERE `id` < 512334 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009655s ]
0.212984s