Daily Programmer Challenges - link:

1. [2018-06-22] Challenge #364 [Hard] Tiling with Pentominos
2. [2018-11-26] Challenge #369 [Easy] Hex colors
3. [2019-02-13] Challenge #375 [Intermediate] A Card Flipping Game
4. [2019-01-14] Challenge #372 [Easy] Perfectly balanced
5. [2019-03-13] Challenge #376 [Intermediate] The Revised Julian Calendar
6. [2019-02-15] Challenge #375 [Hard] Graph of Thrones