In zig, cause we gotta go fast B)
Run code with zig build run -Doptimize=ReleaseFast
Measurements are taken from an average of 100 runs on my Ryzen 5950x processor (~4.2GHz) I compile everything with -OReleaseFast Every day is programmed as a function that receives a string and returns a pair of ints. This is what is measured, I decided not to include file I/O in the benchmarks because it causes a lot of variance and is not very interesting (imho) to optimize.
Year 2015
Day 1 in 3 μs Part 1: 74 Part 2: 1795
Day 2 in 41 μs Part 1: 1586300 Part 2: 3737498
Day 3 in 306 μs Part 1: 2592 Part 2: 2360
Day 4 in 372197 μs Part 1: 117946 Part 2: 3938038
Day 5 in 116 μs Part 1: 258 Part 2: 53
Year time: 372665 μs
Year 2016
Day 1 in 5 μs Part 1: 239 Part 2: 141
Year time: 5 μs
Year 2020
Day 1 in 2 μs Part 1: 719796 Part 2: 144554112
Day 2 in 17 μs Part 1: 460 Part 2: 251
Day 3 in 1 μs Part 1: 265 Part 2: 3154761400
Day 4 in 38 μs Part 1: 170 Part 2: 103
Day 5 in 2 μs Part 1: 926 Part 2: 657
Day 6 in 24 μs Part 1: 6596 Part 2: 3219
Day 7 in 44 μs Part 1: 119 Part 2: 155802
Day 8 in 33 μs Part 1: 2051 Part 2: 2304
Day 9 in 49 μs Part 1: 85848519 Part 2: 13414198
Day 10 in 0 μs Part 1: 2400 Part 2: 338510590509056
Year time: 215 μs
Year 2021
Day 1 in 19 μs Part 1: 1387 Part 2: 1362
Day 2 in 5 μs Part 1: 1488669 Part 2: 1176514794
Day 3 in 96 μs Part 1: 3969000 Part 2: 4267809
Day 4 in 87 μs Part 1: 49686 Part 2: 26878
Day 5 in 152 μs Part 1: 9723 Part 2: 22116
Day 6 in 0 μs Part 1: 388419 Part 2: 1740449478328
Day 7 in 17 μs Part 1: 343605 Part 2: 96744904
Day 8 in 19 μs Part 1: 284 Part 2: 973499
Day 9 in 3 μs Part 1: 518 Part 2: 0
Year time: 403 μs
Year 2022
Day 1 in 26 μs Part 1: 74711 Part 2: 209481
Day 2 in 3 μs Part 1: 11063 Part 2: 10349
Day 3 in 23 μs Part 1: 7737 Part 2: 2697
Day 5 in 17 μs Part 1: HBTMTBSDC Part 2: PQTJRSHWS
Day 6 in 4 μs Part 1: 1042 Part 2: 2980
Day 7 in 13 μs Part 1: 1477771 Part 2: 3579501
Day 9 in 416 μs Part 1: 6284 Part 2: 2661
Day 10 in 1 μs Part 1: 12880 Part 2: FCJAPJRE
Day 11 in 2549 μs Part 1: 110220 Part 2: 19457438264
Day 12 in 22 μs Part 1: 481 Part 2: 480
Year time: 3078 μs
Year 2023
Day 1 in 44 μs Part 1: 54239 Part 2: 55524
Day 2 in 15 μs Part 1: 2268 Part 2: 63542
Year time: 59 μs
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Total time: 376427 μs