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#algorithms#leetcode

DEVMay 3, 2026 · 22h ago

I Solved 200 LeetCode Problems and Still Froze in Interviews

A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe

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DEVMay 3, 2026 · 1d ago

Java LLD: Designing a High-Concurrency Elevator System

Java LLD: Designing a High-Concurrency Elevator System Designing an elevator system is a classic "Machine Coding" round favorite because it tests concurrency, state management, and algorithmic efficiency simultaneously. At companies like Apple or Amazon, interviewers aren't just looking for a working loop; they are looking for thread safety and optimal scheduling. Using a simple Queue<Integer>

#java#systemdesign#interview#concurrency