I think CTCI + leetcode free is enough
Use them all. Perform a multi prong attack. Try to get full enfilade on your prep process
I feel leetcode premium is enough for questions and technique, but highly depends on how you do it. Whether you're just trying to nail down questions or solve on your own and go through the discussion and learn from the various solutions there and actually retain that learning.
Leetcode premium really helps
what's EPI?
Ctci / epi choose one Plus leetcode premium In fb it was surprisingly accurate even if not up to date from internal sources. But def some of the questions were slightly modified versions
CTCI is the easy level. Do it if it's your first time in this game. If you have some "experience" do EPI. And do leetcoding in parallel with books in any case.
EPI first and leetcode premium both.
EPI >> CTCI. Buy CTCI if you’re starting out though.
Why not all 3?