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 cat

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: - Skiena algorithm book: https://www.amazon.com/Algorithm-Design-Manual-Steve-Skiena/dp/0387948600/ref=nav_signin?s=books&ie=UTF8&qid=1471460903&sr=1-5&keywords=the+algorithm+design+manual& 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/ 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.