Patterns: hashing, pointers, windows, binary search
Episode 15 Arrays & Hashing I
▶ This video is coming to YouTube soon.
You'll be able to solve LeetCode 217, 242, 169 and 268, each by brute force, a better and the best approach, and know the patterns behind them: a HashSet for have-I-seen-it, counting for how-many-of-each, Boyer–Moore voting, and the sum and XOR tricks.
Quiz: test yourself
The 3 questions from the end of the episode. Pick an answer to see why it's right.