000. Longest Two-Character Substring;
218. To-Do List Pt. I;
380. Smooshed Morse Code;
01. Sum of Powers;
Day 1: The Tyranny of the Rocket Equation;
To-Do List (Intermediate);
Smooshed Morse Code (Intermediate);
Day 2: 1202 Program Alarm;
Fermat's Little Theorem (Intermediate);
Linear Feedback Shift Register (Intermediate);