Multi-Language V8 Engine
Execute and test solutions in JavaScript, Python, C++, Java, and MySQL.
Automated Test Validation
Verify edge cases, boundary inputs, and time/space constraints instantly.
Curated FAANG Patterns
Master sliding window, two pointers, graphs, dynamic programming, and system design.
Detailed Performance Metrics
Benchmarked runtime execution speed and memory allocations per submission.
Two Sum Optimization
Browse Practice Challenges
Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
Design a data structure that follows the constraints of a Least Recently Used (LRU) cache with O(1) get and put operations.
You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the linked-lists into one sorted linked-list.
Given a string s, return the longest palindromic substring in s using dynamic programming or expand around center.
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
Write a SQL query to find employees who have the top three unique salaries in each department using DENSE_RANK() window function.