See https://adventofcode.com/2021 for problems.
Use :l DayXX.hs
in ghci to load solution for particular day.
*Day01> main
1393
1359
(0.09 secs, 24,340,640 bytes)
*Day02> main
1882980
1971232560
(0.02 secs, 14,856,096 bytes)
*Day03> main
4118544
3832770
(0.03 secs, 13,718,912 bytes)
*Day04> main
33462
30070
(0.15 secs, 115,806,776 bytes)
*Day05> main
7468
22364
(0.73 secs, 581,462,992 bytes)
*Day06> main
343441
1569108373832
(0.02 secs, 5,165,872 bytes)
*Day07> main
333755
94017638
(1.41 secs, 1,792,182,920 bytes)
*Day08> main
294
Just 973292
(0.05 secs, 26,149,632 bytes)
*Day09> main
502
1330560
(0.94 secs, 1,179,047,576 bytes)
*Day10> main
193275
2429644557
(0.04 secs, 14,551,416 bytes)
*Day11> main
1705
265
(0.31 secs, 336,583,888 bytes)
*Day12> main
4241
122134
(17.48 secs, 15,744,407,480 bytes)
*Day13> main
695
".**....**.****..**..*....*..*.***....**"
"*..*....*....*.*..*.*....*..*.*..*....*"
"*.......*...*..*....*....*..*.*..*....*"
"*.**....*..*...*.**.*....*..*.***.....*"
"*..*.*..*.*....*..*.*....*..*.*....*..*"
".***..**..****..***.****..**..*.....**."
(0.04 secs, 24,602,352 bytes)
*Day14> main
3406
3941782230241
(0.06 secs, 39,255,416 bytes)
*Day15> main
472
2851
(4.61 secs, 4,572,872,264 bytes)
*Day16> main
854
186189840660
(0.03 secs, 30,075,856 bytes)
*Day17> main
4560
3344
(4.17 secs, 3,979,006,864 bytes)
*Day18> main
3691
4756
(3.02 secs, 3,557,743,832 bytes)
*Day19> main
308
12124
(TBD, TBD)
*Day20> main
5359
12333
(23.66 secs, 15,742,436,472 bytes)
*Day21> main
918081
158631174219251
(145.36 secs, 133,995,506,696 bytes)
*Day22> main
524792
1213461324555691
(3.07 secs, 4,548,786,096 bytes)
*Day23> main
15358
51436
(TBD, TBD)
*Day24> main
99291593199892
73181221197111
(0.01 secs, 855,960 bytes)
*Day25> main
523
"Merry Christmas and Happy New Year!"
(36.81 secs, 26,040,310,880 bytes)