This page was mentioned in chat and I thought it would be useful to save here in the forum:
https://heidi-newton.com/blog/getting-good-at-leetcode
She also has a also a post on math:
https://heidi-newton.com/blog/rediscovering-a-passion-for-math
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Here is a list of curated problems.
Here are some YouTube channels where you can watch people solve problems.
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