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    • Showing only topics with the tag "advent of code.2021". Back to normal view

    1. Day 23: Amphipod

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/23 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/23

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      6 votes

    2. Day 19: Beacon Scanner

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/19 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/19

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      9 votes

    3. Day 24: Arithmetic Logic Unit

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/24 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/24

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      6 votes

    4. Day 25: Sea Cucumber

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/25 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/25

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      5 votes

    5. Day 22: Reactor Reboot

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/22 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/22

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      6 votes

    6. Day 18: Snailfish

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/18 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/18

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      9 votes

    7. Day 21: Dirac Dice

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/21 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/21

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      6 votes

    8. Day 17: Trick Shot

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/17 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/17

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      8 votes

    9. Day 20: Trench Map

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/20 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/20

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      8 votes

    10. Day 15: Chiton

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/15 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/15

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      12 votes

    11. Day 14: Extended Polymerization

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/14 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/14

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      11 votes

    12. Day 13: Transparent Origami

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/13 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/13

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      13 votes

    13. Day 12: Passage Pathing

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/12 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/12

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      12 votes

    14. Day 16: Packet Decoder

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/16 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/16

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      9 votes

    15. Day 5: Hydrothermal Venture

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/5 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/5

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      16 votes

    16. Day 11: Dumbo Octopus

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/11 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/11

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      13 votes

    17. Day 10: Syntax Scoring

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/10 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/10

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      15 votes

    18. Day 9: Smoke Basin

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/9 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/9

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      12 votes

    19. Day 8: Seven Segment Search

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/8 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/8

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      11 votes

    20. Day 7: The Treachery of Whales

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/7 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/7

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      14 votes

    22. Day 1: Sonar Sweep

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/1 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/1

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      15 votes

    23. Day 4: Giant Squid

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/4 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/4

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      13 votes

    24. Day 6: Lanternfish

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/6 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/6

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      14 votes

    25. Day 2: Dive!

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/2 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/2

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      16 votes

    26. Day 3: Binary Diagnostic

      ~comp Text 73 words
      Today's problem description: https://adventofcode.com/2021/day/3 Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it...

      Today's problem description: https://adventofcode.com/2021/day/3

      Please post your solutions in your own top-level comment. Here's a template you can copy-paste into your comment to format it nicely, with the code collapsed by default inside an expandable section with syntax highlighting (you can replace python with any of the "short names" listed in this page of supported languages):

      <details>
<summary>Part 1</summary>

```python
Your code here.
```

</details>
      13 votes

    27. The temporary sub-group for Advent of Code is back - subscribe if you're interested!

      ~comp Text 163 words
      As we did for the last two years, I've set up a temporary sub-group that we can use for this year's Advent of Code at ~comp.advent_of_code I moved all the Day 1 solutions that were posted in the...

      As we did for the last two years, I've set up a temporary sub-group that we can use for this year's Advent of Code at ~comp.advent_of_code

      I moved all the Day 1 solutions that were posted in the thread that @JRandomHacker posted into a dedicated post for the Day 1 problem, and I've set up scheduled posts to happen automatically as each day's puzzle unlocks.

      I also automatically subscribed everyone that voted on that original topic, as well as everyone that posted a comment in any of the previous years' topics, but nobody else. So if you're interested in participating in Advent of Code or discussing it, please subscribe to the sub-group. Posts from the sub-group won't be shown to logged-out users by default either, so any logged-out users that want to observe will need to visit the sub-group directly (or you're welcome to email me and request an invite so you can register and subscribe).

      24 votes