# [Advent of Code 2015](https://adventofcode.com/2015)

| Solved   | Day    | Topics                | Language   |
| :------: | :----: | :-------------------- | :--------- |
| ✓        | 01     | Arithmetic            | Ruby       |
| ✓        | 02     | Geometry              | Ruby       |
| ✓        | 03     | Navigation            | Ruby       |
| ✓        | 04     | Hashing               | Rust       |
| ✓        | 05     | String validation     | Ruby       |
| ✓        | 06     | Arithmetic            | Ruby       |
| ✓        | 07     | Interpreting          | Rust       |
| ✓        | 08     | String escaping       | Ruby       |
| ✓        | 09     | Graph search          | Rust       |
| ✓        | 10     | Parsing               | Ruby       |
| ✓        | 11     | Password validation   | Ruby       |
| ✓        | 12     | Recursion             | Ruby       |
| ✓        | 13     | Optimization          | Ruby       |
| ✓        | 14     | Score calculation     | Ruby       |
| ✓        | 15     | Permutations          | Ruby       |
| ✓        | 16     | Searching             | Ruby       |
|          | 17     | Combinations          |            |
| ✓        | 18     | Game of Life          | Ruby       |
|          | 19     |                       |            |
|          | 20     |                       |            |
|          | 21     |                       |            |
|          | 22     |                       |            |
|          | 23     |                       |            |
|          | 24     |                       |            |
|          | 25     |                       |            |