practice: add questions on time complexity (Big-O)

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调研方向

阅读 shared/practice/questions.json 中现有的编程题,遵循其结构和惯例。在编程主题中添加三道原创的 Big-O 选择题,每题包含四个选项、一个 answerId 和一段推理说明。运行 npm ci 和 npm test;当题库检查在加入新题后通过,且现有 ID 保持不变时,修改即告完成。

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描述

enhancement good first issue

What to add

Add 3 original multiple-choice questions on time complexity (Big-O) to the programming topic in shared/practice/questions.json.

The programming topic has 6 questions and none of them cover time complexity (Big-O) yet. Some ideas (write your own wording and numbers):

  • the complexity of a single loop over n items
  • the complexity of two nested loops over n items
  • comparing two approaches to the same task (binary search is already covered)

Look at the existing programming questions in the file first and follow the same shape.

Requirements

  • The questions must be your own. Do not copy from books, websites, coaching material, or past papers.
  • Each question has exactly 4 options (a to d), one answerId, and an explanation that shows the reasoning or working, not only the answer.
  • Use "topicId": "programming" and "difficulty": "easy" or "medium". A mix of both is welcome.
  • Give each question a new lowercase ID, for example programming-nested-loop-complexity. Do not change existing IDs.
  • Indian context is welcome (Rs, km, common names).

Check your change

npm ci
npm test

npm test checks the question bank (unique IDs, four distinct options, a valid answer). If you have the .NET SDK, also run dotnet test backend/ProCoderJi.slnx --configuration Release. If you don't, CI runs the backend tests on your pull request.

Before you start

Leave a comment here when you start so others can pick a different issue. New to open source? Start with CONTRIBUTING.md. Questions are welcome in the comments.

主要语言
TypeScript
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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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