Don’t worry about the algorithm questions… companies asking that are just google-wannabe companies that don’t deserve you. I have always told recruiters “if there’s a time-limited interview test, I’m out”, and I’m doing very well for myself now.
If you’re desperate, unfortunately, you have to pick up a book on algorithms… one of those 600 pages book, and start reading…
Is it one that you just use and works just fine? Or one that has proven to be reliable and responsible if they do a mistake and only want to satisfy you as a customer?
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I would say with confidence that your knowledge in computers and solving problems contributed to your success.