Most teachers introduce solutions as fully-formed recipes. But in doing so, they totally miss how solutions are DISCOVERED. In painstaking detail, I go through this crucial missing piece and demonstrate how to methodically attack problems from every possible angle. My teaching: Two sum problem: My video for Two Sum II (the sequel to this problem): 0:00 Two sum problem statement 0:19 Initial thought process 1:12 Brute-force implementation & analysis 3:00 Optimizing our initial approach 7:25 Implementing a faster algorithm 7:47 One-pass? 9:52 Awkward code 12:00 The most important part