Questions Bank

How to use this bank

• Do this after a first pass through the topic-by-topic roadmap, not instead of it — this drills recognition, it doesn't teach the underlying patterns.
• Work the list top to bottom, one sitting at a time. The order is fixed and random on purpose — resist the urge to skip ahead to a "nicer looking" problem, that's exactly the crutch a real interview won't give you. Select random is the other mode: one cold pick from whatever the filters currently show, unsolved first.
• Before opening any hints or a solution, spend at least a few minutes stating out loud which pattern you think applies and why. That call is the actual skill being tested here.
• The only tag on a row is which NeetCode practice list the problem sits on. NC 250 marks the 31 curated staples — narrow to those with the List filter if you're short on time. NC All is the wider catalog, and a handful of older entries predate both lists and carry no tag at all.
• 118 of these are LeetCode Premium and need a paid subscription to open. Unlike the roadmap, there are no free mirrors listed here — set the Access filter to Free only if you don't have Premium, there's more than enough left.
• None of these 505 problems appear anywhere else on the roadmap — solving them here doesn't double-count toward the main roadmap's progress stats, and vice versa.