Arrays and hashing appear in every MAANG interview. I'm not exaggerating. Every single one. The core idea is simple: hash maps give you lookup. When you need to check "have I seen this before?" or "what's the count of X?", a hash map is your answer. In this section, you'll learn to use hash maps for frequency counting, complement finding, and grouping. These patterns solve dozens of interview problems.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/maang-interview-prep/arrays-hashing/intro
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░██████████████████████████████████████████████████████████████████████