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)