If you are currently searching for a job or planning to start the process soon (or just want to practice some more algorithm questions), I highly recommend checking out pramp.com. It allows you to pair with others at similar level as you and practice solving algorithm questions while walking the other person through your thought process. So far I have done 6 practice interviews and already I can definitely see myself improving. It is also a great way to force yourself to set time aside to study algorithms every week, check it out if you want!
disclaimer/additional info: If you use my link, I will get an additional interview credit. Sharing the site is the only way to get more interview credits so by signing up (if you think you would actually use the site), you’re helping me out as well!