Let me try a contrarian suggestion on the peanut gallery (and maybe the OP will buy too): LeetCode is bad pedagogy precisely because it's repetitive. Consider

Let me try a contrarian suggestion on the peanut gallery (and maybe the OP will buy too): LeetCode is bad pedagogy precisely because it's repetitive. Consider this problem: https://codingcompetitions.withgoogle.com/codejam/round/000000000043580a/00000000006d1155 https://codingcompetitions.withgoogle.com/codejam/round/0000... Several articles have been written about it, and the winning submissions all implement generic numerical integration in like 10 lines of code (a few even implement Simpson's rule), which is sort of neat it its own right. From reading solutions to other CodeJam/TC/SPOJ problems I've also come across similarly compact implementations of matrix inversion, linear optimization, etc. It sounds like your math chops are more than good enough, and these companies just want to test if you understand 80's computer science anyway. If you study interesting solutions to hard problems, you might stay interested and you might even improve more at boring LeetCode problems than you did after grinding. Chess puzzles help up to a point, but eventually to get better you have to start reading books, and that point comes before all chess puzzles are easy. Pushups help up to a point, but eventually to get stronger you have to switch to a barbell, and that point comes before you can do a million pushups. Finally, I've given this advice in other comments, but if you're just posting this because you want to get hired, my experience is that it's better to focus on interviewing more than on LeetCode. Specifically: think of getting hired as a numbers game, and think of applying for a job as a sales process. That means having a funnel for companies, e.g. "discovered -> openings available -> resume drop -> recruiter screen -> interview round 1,2,3 -> offer". Make a spreadsheet and start filling it; don't just list companies you know about, start googling tech you're interested in to find more companies you can add. If certain types of interviews seem to go better, look for similar companies you can add, and wait to optimize your performance (e.g. with LeetCode) until you do notice a big drop-off in your funnel (e.g. recruiter screen, first round interview).