20
๐ฆ - 2023 DAY 9 SOLUTIONS -๐ฆ
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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.
Solution Threads
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Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
console.log('Hello World')
Nim
Part 1:
The extrapolated value to the right is just the sum of all last values in the diff pyramid.
45 + 15 + 6 + 2 + 0 = 68
Part 2:
The extrapolated value to the left is just a right-folded difference (right-associated subtraction) between all first values in the pyramid. e.g.
10 - (3 - (0 - (2 - 0))) = 5
So, extending the pyramid is totally unneccessary.
Total runtime: 0.9 ms
Puzzle rating: Easy, but interesting 6.5/10
Full Code: day_09/solution.nim
Snippet: