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Training notes, problem walkthroughs, lessons from the gym.
The rank shield is the last thing I look at when I want to know if a student is improving. Here are the three signals I actually trust — and how to spot them yourself.
The XP formula on this platform is partly arbitrary. Any specific number for what a hard problem is worth is a guess. T…
When I built the submission flow I had to name the state where a problem didn't pass review. The obvious word was …
Every first call with a new parent covers the same ground. Here's exactly what I say — and why I say it before we …
Every two-pointer solution works for the same reason binary search works. Once you see the connection, you stop memoris…
Layer thinking turns most graph problems into BFS variants. Once you can describe what one BFS layer means in your prob…
Three problems, one mental model. Bitmask DP clicks when you stop thinking about the cache and start thinking about wha…
Weekend cramming feels productive but doesn't compound the way daily work does — here's what fifteen minutes …
A coach's honest account of why auto-graders can't replace human review, why LeetCode alone won't get yo…