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High-signal articles on system design, algorithms, career strategy, and engineering craft. Written by engineers who've been there.
Master the 3Sum problem with Sort + Two Pointers, avoid the duplicate-skipping traps that trip up most candidates, and learn the pattern that unlocks a whole class of interview questions.
Learn how to crack the Next Permutation problem in interviews — from building the right intuition to avoiding the exact mistakes most candidates make under pressure.
Most candidates flatten everything into a heap and call it done. Here's why that costs you the offer — and what the optimal O(N log k) approach looks like.