Always memorize the Time and Space complexity for each pattern. Interviewers care about why your solution is efficient. Better (and Legal) Alternatives
Look at the visual diagrams. "Grokking" is famous for its step-by-step illustrations. grokking+the+coding+interview+github+pdf+full
Go to GitHub. Fork a legitimate pattern summary repo. Open LeetCode. Turn off your WiFi (so you can't search for solutions). Struggle through the problems. That struggle is where learning happens—not in a downloaded PDF. Always memorize the Time and Space complexity for