[BE] - Tran Thanh Hai#294
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Implement solutions for Problem 4, 5, and 6 of the 99Tech code challenge: three sum algorithms, a CRUD REST API with SQLite, and a real-time scoreboard spec with runnable demo.
Problem 4 — Sum to N
Three implementations of sum_to_n:
Short README and NOTES.md with complexity comparison.
Problem 5 — CRUD API
REST API with Express + TypeScript and SQLite (better-sqlite3).
Endpoints: create, list (filter/search/pagination), get, update, delete at /api/resources.
Layered layout: app.ts, db/, items/ (repository, handlers, routes).
Integration tests with Jest + Supertest (22 cases).
Problem 6 — Real-Time Scoreboard
API spec: auth, action tokens, anti-cheat, rate limiting, WebSocket live updates.
Runnable in-memory demo split into modules (store, auth, actions, leaderboard, rateLimiter).
Demo client HTML for login, score actions, and live top-10 board.
Condensed docs (README, flow diagram, improvements) and Jest tests importing the app directly (17 cases).
Test plan
Problem 4: cd src/problem4 && npm start
Problem 5: cd src/problem5 && npm test
Problem 6: cd src/problem6/demo && npm test