this post was submitted on 22 Dec 2024
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Advent Of Code
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An unofficial home for the advent of code community on programming.dev!
Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.
AoC 2024
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M | T | W | T | F | S | S |
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1 | ||||||
2 | 3 | 4 | 5 | 6 | 7 | 8 |
9 | 10 | 11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 | 21 | 22 |
23 | 24 | 25 |
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console.log('Hello World')
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C
Really proud of this one! Started with with an O(n^atoms in the universe) scan which took 44s even after adding a dedup check.
But iterating on a trick to encode the deltas for the dedup check, using it to build a mapping table here, a lookup there etc brought it down to a very fast, fairly low memory, linear complexity solution!
Code
day22 0m00.04s real
https://codeberg.org/sjmulder/aoc/src/branch/master/2024/c/day22.c