Coding Challenges
Master your coding skills with daily challenges. Practice DSA, Web Development, SQL, Machine Learning, and more. Compete on leaderboards and earn badges!
Challenge of the Week
Design an Online Food Delivery System (like Swiggy/Zomato)
Design a scalable food delivery system with restaurant management, order tracking, delivery assignment, and real-time updates. Consider high availability, consistency, and fault tolerance.
Move Zeros to End (Stable)
Given array nums, move all zeros to the end preserving order. Do it in-place.
Longest Subarray Sum ≤ K
For non-negative nums and K, find max length subarray with sum ≤ K.
Shortest Path with Obstacles
Grid 0 = free, 1 = wall. You may remove up to k walls. Find shortest path from (0,0) to (m-1,n-1) or -1.
Debounced Search Box
Build a search box that calls /api/search?q= only after 400ms of no typing. Show "Searching..." while pending.
URL Shortener Backend
Implement POST /shorten {url} → returns {code}, and GET /:code → redirects. Add rate limit.
2nd Highest Salary per Department
Find the second highest salary in each department. Return NULL if not exists.
Titanic Mini Classification
Train/test split (80/20), Logistic Regression, report accuracy + ROC-AUC.
Button Debounce (Timer-based)
Toggle LED on button press with debounce 50ms using timer (no delay loops).
Password Strength Checker
Given a string, score 0–4 based on: length≥8, upper, lower, digit, special.
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