This is my personal recommendation, please notice that I have read "Introduction to Algorithm by Cormen" about 4 years ago, so for me everything was more a catch up than really learning:
for this book one can focuses on the first 7 chapters (revision)
- Leet code editorial solutions https://leetcode.com/articles/ . They provide with the solution and complexity analysis of a few problems. I suggest you try to solve and give your complexity analysis then compare it with the "official" one.
- Skiena algorithm book: https://www.amazon.com/Algorithm-Design-Manual-Steve-Skiena/...
for this book one can focuses on the first 7 chapters (revision)
- Leet code editorial solutions https://leetcode.com/articles/ . They provide with the solution and complexity analysis of a few problems. I suggest you try to solve and give your complexity analysis then compare it with the "official" one.