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说明
A coding interview is not a memory test. The interviewer wants to hear why one working answer beats another. The app starts with exactly that: one real question, Two Sum, and two correct solutions running side by side on the same 64 numbers, with every comparison counted on your screen. Same answer, far more work. That gap is what big O notation and time complexity are about.
THREE TRACKS, 90 COURSES
• Data Structures & Algorithms: complexity, arrays and two pointers, strings, sorting, binary search, linked lists, stacks and queues, hash maps, recursion, trees, heaps, graphs with BFS and DFS, backtracking, greedy algorithms, dynamic programming, shortest paths, tries, union-find, bit manipulation and system design basics
• SQL for interviews: SELECT and WHERE gotchas, top-N questions, GROUP BY and HAVING, every kind of JOIN, NULL handling, subqueries and CTEs, window functions (ROW_NUMBER, RANK, LAG, LEAD), gaps and islands, cohort and funnel analysis, EXPLAIN and indexing, transactions, schema design
• Competitive Programming: online judges and verdicts, fast input and output, "will it pass" estimates, prefix sums, complete search, number theory and combinatorics, advanced DP, Dijkstra, Fenwick and segment trees, string algorithms and game theory
The first course of every track is free: SQL Fundamentals Interview Questions, Python Warm-Up for DSA, and Welcome to the Arena.
60 CODING PROBLEMS YOU SOLVE IN PYTHON
• A built-in code editor: write your solution, run it and get it checked
• 20 easy, 20 medium and 20 hard coding challenges, from Two Sum, Valid Parentheses and Binary Search to Merge Intervals, Coin Change, Trapping Rain Water, Edit Distance and Word Break
• Grouped by pattern: arrays and hashing, strings, two pointers, sliding window, matrix, dynamic programming, greedy and backtracking
20 GUIDED PATTERN PROJECTS
• Build one pattern step by step: two pointers, hash maps, sliding window, binary search, stack, BFS on a grid, tree DFS, heap top-k, intervals, tries, prefix sums, graph algorithms and more
• At every step you pick the right code block and see why it works
PRACTICE BETWEEN SESSIONS
• 50 interview questions and answers as flip cards: think first, then reveal the answer
• 50 quiz questions and review sessions to turn "I read it" into "I remember it"
• A cheat sheet with 67 entries on data structures, algorithms and SQL
• Save questions, keep notes on any lesson, and build streaks and XP
• An AI mentor that explains a concept in plain language when it refuses to click
WHO IT IS FOR
• Students preparing for a first internship or graduate role
• Developers getting ready for a technical interview
• Data analysts and engineers who expect SQL questions in a hiring loop
• Anyone who wants to learn algorithms properly, not just memorize answers
Lessons are short enough for a commute. The app is available in 22 languages.
FREE AND PRO
Free: the first course of each track, two coding problems, one guided project, the question cards, the quiz, the cheat sheet and three AI mentor questions a day.
Pro unlocks all 90 courses, all 60 coding problems, all 20 guided projects, course certificates and unlimited AI mentor answers. Subscriptions renew automatically and can be cancelled at any time in Google Play.
Privacy policy: https://coddykit.com/terms/privacy-policy
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新版变化
- 版本: 82.6.2
- 最后更新:
- • Refreshed look and smoother experience across the app
• Improved translations — lessons and screens in your language
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Coding Interview Prep: DSA/SQL
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Coding Interview Prep: DSA/SQL 短网址: 已复制!- Google Play
在 AppAgg 上，您可以关注由 Coddykit 开发的“Coding Interview Prep: DSA/SQL”应用。适用平台：Android；分类：教育。 AppAgg 评分：1,560（青铜）。 AppAgg 为该应用记录的积分：已确认 0，间接 0。 收录此应用的公开列表：0 个。将其保存到私密列表的用户：0 人。 AppAgg 用户尚未对该应用评分。 已确认积分记录已登录 AppAgg 用户前往商店的操作，间接积分则基于商店数据。 两个计数分别表示公开列表数量，以及将应用或游戏保存到私密列表的用户人数。 该应用首次发布于。 该应用最近更新于。 该应用目前可免费获取。 查看价格历史、将应用加入列表，或关注开发者。 通过RSS 订阅源关注该应用今后的优惠和更新。 AppAgg 不托管或分发该应用。 与该应用相关的所有商标、徽标和屏幕截图均归其各自所有者所有。
