1582 articles
Master LeetCode 85 — Maximal Rectangle by building on LC 84 Largest Rectangle in Histogram. Learn the row-as-histogram insight, a visual row-by-row dry run, common pitfalls, and clean Python + JavaScript solutions that interviewers love.
LeetCode 493 trips up even strong candidates because the count step must happen before the merge step — not during it. Learn exactly why that ordering matters, trace through a full dry run on [1,3,2,3,1], understand the five most common bugs, and walk away with clean Python and JavaScript solutions you can reproduce under pressure.
Master LeetCode 410: learn why binary searching on the answer (not the array) is the key insight, walk through a full greedy feasibility check, and see both the DP and binary search solutions with line-by-line commentary.
Negative numbers completely break the classic sliding window for minimum-length subarray problems. Learn exactly why, then master the only correct approach — a monotonic deque on prefix sums — with a step-by-step visual trace, the three mistakes every candidate makes, and every real interview follow-up with approach hints.
Master LeetCode 327 — Count of Range Sum — with deep intuition, a visual dry run, brute-force to O(n log n) merge sort progression, and real interview follow-ups covering BIT, LC 315, and LC 493.