Top 5 Rust advent-of-code-2019 Projects
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Project mention: [2021 Day 1-25][Rust] Solutions to all of this year's problems in terse and clean Rust | reddit.com/r/adventofcode | 2021-12-25
2019 in Rust
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Solution in Go: kvrhdn/Advent-of-Code//advent-of-code-2021/day20/day20.go
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Project mention: [2021 Day 24] Solving the ALU programmatically with no assumptions about the input | reddit.com/r/adventofcode | 2021-12-24
Here's the source; it helps that I also use codegen to create a fast evaluator for each block, instead of using tree walking.
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Group the fish by their timer, which can be anything from 0 to 8. The neat part is the rotate_left to decrease the timers of each group. Fish with timer 0 will automatically end up at timer 8, and so the only thing left to do is adding another copy with timer 6. Core function: rust fn multiply(timers: Vec, generations: usize) -> usize { // Index equals timer value, so index 0 contains the count of fish with timer 0 let mut counts_by_timer = vec![0usize; 9]; timers.into_iter().for_each(|f| { counts_by_timer[f] += 1; }); for _ in 0..generations { // A left rotation represents the timer (=index) decreasing by 1. // The fish with timer 0 will not only produce new fish with timer 8, // but also reset their timer to 6 let count_of_fish_with_timer_0 = counts_by_timer[0]; counts_by_timer.rotate_left(1); counts_by_timer[6] += count_of_fish_with_timer_0; // == counts_by_timer[8] } counts_by_timer.into_iter().sum() } Full code at Github
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Rust in ~600us
Rust advent-of-code-2019 related posts
Index
What are some of the best open-source advent-of-code-2019 projects in Rust? This list will help you:
| Project | Stars | |
|---|---|---|
| 1 | AdventOfCode2019 | 9 |
| 2 | Advent-of-Code | 9 |
| 3 | advent-of-code | 4 |
| 4 | advent_of_code | 1 |
| 5 | adventofcode | 0 |
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