Faster approach using Tarjan's algorithm to cache cycles

Author: maneatingape

README.md

@@ -122,7 +122,7 @@ Performance is reasonable even on older hardware, for example a 2011 MacBook Pro
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 | 14 | [Parabolic Reflector Dish](https://adventofcode.com/2023/day/14) | [Source](src/year2023/day14.rs) | 632 |
 | 15 | [Lens Library](https://adventofcode.com/2023/day/15) | [Source](src/year2023/day15.rs) | 84 |
-| 16 | [The Floor Will Be Lava](https://adventofcode.com/2023/day/16) | [Source](src/year2023/day16.rs) | 826 |
+| 16 | [The Floor Will Be Lava](https://adventofcode.com/2023/day/16) | [Source](src/year2023/day16.rs) | 160 |
 | 17 | [Clumsy Crucible](https://adventofcode.com/2023/day/17) | [Source](src/year2023/day17.rs) | 2289 |
 | 18 | [Lavaduct Lagoon](https://adventofcode.com/2023/day/18) | [Source](src/year2023/day18.rs) | 17 |
 | 19 | [Aplenty](https://adventofcode.com/2023/day/19) | [Source](src/year2023/day19.rs) | 100 |