4835e36925af

--- a/.lispwords	Sun Dec 01 16:01:05 2019 -0500
+++ b/.lispwords	Tue Dec 03 20:15:07 2019 -0500
@@ -1,2 +1,2 @@
-(1 let-complex)
+(1 let-complex let-result)
 (3 define-problem)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2017/10.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,1 @@
+129,154,49,198,200,133,97,254,41,6,2,1,255,0,191,108

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2017/11.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,1 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2017/12.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,2000 @@
+0 <-> 82
+1 <-> 41, 1402
+2 <-> 454, 1690
+3 <-> 533, 1726
+4 <-> 82
+5 <-> 202, 1769
+6 <-> 682, 789, 1295
+7 <-> 1243, 1500
+8 <-> 1630
+9 <-> 847, 1922
+10 <-> 446
+11 <-> 98, 172, 859, 1303
+12 <-> 1748
+13 <-> 334
+14 <-> 850, 1537, 1627, 1747
+15 <-> 194, 722, 1091, 1290
+16 <-> 537, 965, 1642
+17 <-> 371
+18 <-> 422, 436, 1795
+19 <-> 487, 872, 1845
+20 <-> 423, 561, 1313, 1984
+21 <-> 62, 760
+22 <-> 62, 126, 586, 1472
+23 <-> 1057, 1809, 1938
+24 <-> 24, 986
+25 <-> 1758
+26 <-> 1780
+27 <-> 622, 748
+28 <-> 1048, 1617
+29 <-> 451, 751, 866, 1885
+30 <-> 501
+31 <-> 134, 218, 1993
+32 <-> 629
+33 <-> 1774
+34 <-> 1011, 1151
+35 <-> 1432
+36 <-> 202
+37 <-> 664, 1021, 1159
+38 <-> 103, 1123, 1228
+39 <-> 1816
+40 <-> 896
+41 <-> 1, 1905
+42 <-> 224, 824, 1453
+43 <-> 1926
+44 <-> 703
+45 <-> 438
+46 <-> 251, 1886
+47 <-> 709
+48 <-> 425, 1557, 1944
+49 <-> 1245
+50 <-> 1294
+51 <-> 51, 115, 894, 1624
+52 <-> 629, 882
+53 <-> 112, 1007, 1665
+54 <-> 766, 1169, 1349
+55 <-> 55
+56 <-> 56, 1250
+57 <-> 150
+58 <-> 168, 396, 639, 651
+59 <-> 436
+60 <-> 315, 1556
+61 <-> 1681
+62 <-> 21, 22
+63 <-> 385, 970, 979
+64 <-> 314, 1613
+65 <-> 84, 189, 1167
+66 <-> 777, 1097, 1551
+67 <-> 1380
+68 <-> 384, 500, 1490
+69 <-> 882, 1373, 1982
+70 <-> 264, 1149
+71 <-> 731, 1104, 1897
+72 <-> 442, 1118, 1126, 1392
+73 <-> 1241, 1762
+74 <-> 102
+75 <-> 75, 1153, 1226
+76 <-> 901
+77 <-> 794
+78 <-> 432
+79 <-> 79, 1042, 1086, 1471
+80 <-> 303, 621, 989, 1985, 1992
+81 <-> 118
+82 <-> 0, 4, 848, 1240
+83 <-> 845, 1338
+84 <-> 65, 973
+85 <-> 85, 1352
+86 <-> 378, 1671
+87 <-> 87, 587
+88 <-> 243, 1384
+89 <-> 1214, 1498
+90 <-> 477, 1626, 1788
+91 <-> 1036
+92 <-> 409
+93 <-> 724, 819
+94 <-> 869, 1100
+95 <-> 1394, 1523
+96 <-> 1213
+97 <-> 757
+98 <-> 11, 742, 1556
+99 <-> 508
+100 <-> 997
+101 <-> 1338
+102 <-> 74, 305, 1883
+103 <-> 38, 809, 1701
+104 <-> 104
+105 <-> 675, 993
+106 <-> 1082, 1167, 1600
+107 <-> 473, 1096
+108 <-> 762, 951
+109 <-> 1464, 1489
+110 <-> 662, 682, 1536
+111 <-> 457, 1797
+112 <-> 53, 920
+113 <-> 405, 1927
+114 <-> 1252, 1538
+115 <-> 51
+116 <-> 219, 507
+117 <-> 1562
+118 <-> 81, 1815
+119 <-> 524, 1014, 1344
+120 <-> 1141
+121 <-> 1179, 1418, 1924
+122 <-> 684
+123 <-> 1105
+124 <-> 1554
+125 <-> 674
+126 <-> 22, 1106, 1360
+127 <-> 302, 996, 1449
+128 <-> 137, 786
+129 <-> 492
+130 <-> 505, 1783
+131 <-> 945
+132 <-> 1892
+133 <-> 133, 1362
+134 <-> 31, 555, 1184
+135 <-> 603, 705, 1699, 1821
+136 <-> 1940
+137 <-> 128, 504
+138 <-> 1536, 1956
+139 <-> 192, 800, 1643, 1859
+140 <-> 1119, 1464
+141 <-> 905, 1576
+142 <-> 891, 1512
+143 <-> 157, 905
+144 <-> 439
+145 <-> 1464
+146 <-> 1263
+147 <-> 147
+148 <-> 215
+149 <-> 188
+150 <-> 57, 819
+151 <-> 151
+152 <-> 209, 359
+153 <-> 424, 452, 1473
+154 <-> 1206, 1879
+155 <-> 1560
+156 <-> 821
+157 <-> 143, 616, 1507
+158 <-> 492, 641
+159 <-> 599, 1340
+160 <-> 1790
+161 <-> 545
+162 <-> 750
+163 <-> 163
+164 <-> 817, 1059
+165 <-> 755
+166 <-> 927, 1380
+167 <-> 420, 470, 1533, 1843
+168 <-> 58, 860, 1727, 1817
+169 <-> 227, 1970
+170 <-> 670, 809
+171 <-> 661, 737, 1426, 1716
+172 <-> 11
+173 <-> 184, 1756
+174 <-> 1398, 1464, 1844
+175 <-> 292, 619
+176 <-> 1571
+177 <-> 1187, 1293, 1570
+178 <-> 1370, 1491, 1813
+179 <-> 796, 1381
+180 <-> 309, 988
+181 <-> 278, 324
+182 <-> 699, 1563
+183 <-> 411
+184 <-> 173, 1172
+185 <-> 1507
+186 <-> 1156
+187 <-> 1211
+188 <-> 149, 594, 726, 1612
+189 <-> 65, 1482
+190 <-> 1392, 1953
+191 <-> 1184
+192 <-> 139
+193 <-> 1728
+194 <-> 15
+195 <-> 1113, 1573
+196 <-> 593
+197 <-> 398, 1874, 1942
+198 <-> 584, 1412
+199 <-> 199, 1573, 1837
+200 <-> 1932
+201 <-> 678, 825
+202 <-> 5, 36, 511, 1257, 1961
+203 <-> 1003, 1480
+204 <-> 1764
+205 <-> 319
+206 <-> 396
+207 <-> 272
+208 <-> 904, 1267
+209 <-> 152, 535, 1515, 1873
+210 <-> 380, 1132, 1794
+211 <-> 483
+212 <-> 307
+213 <-> 713, 1337
+214 <-> 1117
+215 <-> 148, 869, 1619
+216 <-> 365
+217 <-> 1447, 1628
+218 <-> 31
+219 <-> 116, 383
+220 <-> 220, 382
+221 <-> 391, 648
+222 <-> 746, 1338
+223 <-> 1174
+224 <-> 42, 336
+225 <-> 790, 1476
+226 <-> 719, 1943
+227 <-> 169
+228 <-> 433, 1144
+229 <-> 258, 800
+230 <-> 1920
+231 <-> 1849
+232 <-> 1888
+233 <-> 233, 1317
+234 <-> 575, 1158
+235 <-> 335, 596, 1918
+236 <-> 327, 608, 1191
+237 <-> 628, 1214, 1448
+238 <-> 238
+239 <-> 383, 1039, 1952
+240 <-> 1023, 1203
+241 <-> 263
+242 <-> 242
+243 <-> 88
+244 <-> 397, 1912
+245 <-> 608
+246 <-> 417, 785, 900, 921, 1488
+247 <-> 592, 1846
+248 <-> 248, 770
+249 <-> 249, 1635
+250 <-> 1940
+251 <-> 46
+252 <-> 520, 1972
+253 <-> 1847
+254 <-> 323
+255 <-> 750, 1391
+256 <-> 747
+257 <-> 502, 1003
+258 <-> 229, 1749
+259 <-> 259
+260 <-> 1916
+261 <-> 1268, 1694, 1975
+262 <-> 262
+263 <-> 241, 1213, 1950
+264 <-> 70
+265 <-> 299, 538
+266 <-> 406
+267 <-> 1609
+268 <-> 1561
+269 <-> 492, 1694
+270 <-> 550, 1427, 1779
+271 <-> 675, 1179, 1294
+272 <-> 207, 603, 1485
+273 <-> 459, 556, 767, 992, 1656, 1983
+274 <-> 1002
+275 <-> 1859
+276 <-> 934, 1980
+277 <-> 1325
+278 <-> 181, 1804
+279 <-> 403
+280 <-> 1705, 1778
+281 <-> 281
+282 <-> 1509
+283 <-> 600, 764
+284 <-> 284, 506, 953, 1770
+285 <-> 815
+286 <-> 560, 1176
+287 <-> 495, 775
+288 <-> 1315
+289 <-> 442, 923
+290 <-> 1524, 1789
+291 <-> 516, 550
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+1833 <-> 374, 542
+1834 <-> 973
+1835 <-> 1042
+1836 <-> 479, 1836
+1837 <-> 199
+1838 <-> 1194
+1839 <-> 731
+1840 <-> 1840
+1841 <-> 528, 1242
+1842 <-> 1895
+1843 <-> 167
+1844 <-> 174, 1964
+1845 <-> 19, 672, 866, 1787
+1846 <-> 247, 1481
+1847 <-> 253, 465, 1607
+1848 <-> 603, 842, 1494
+1849 <-> 231, 1455
+1850 <-> 456, 1442
+1851 <-> 933, 1212
+1852 <-> 1294
+1853 <-> 1667
+1854 <-> 693, 1312
+1855 <-> 293, 1925
+1856 <-> 1476
+1857 <-> 1332
+1858 <-> 1858
+1859 <-> 139, 275
+1860 <-> 1688, 1994
+1861 <-> 1672
+1862 <-> 1938
+1863 <-> 1187, 1466
+1864 <-> 344
+1865 <-> 312, 1811
+1866 <-> 781, 908
+1867 <-> 983
+1868 <-> 1095, 1439, 1593
+1869 <-> 722
+1870 <-> 962, 1351, 1899
+1871 <-> 1287, 1372
+1872 <-> 717, 1242
+1873 <-> 209, 488, 1717
+1874 <-> 197
+1875 <-> 471, 660, 1442
+1876 <-> 788
+1877 <-> 1612
+1878 <-> 604, 1549, 1594
+1879 <-> 154, 1047, 1949
+1880 <-> 1299
+1881 <-> 631, 917, 984
+1882 <-> 759, 1207, 1882
+1883 <-> 102
+1884 <-> 1417
+1885 <-> 29
+1886 <-> 46, 718, 1886
+1887 <-> 657
+1888 <-> 232, 808, 876, 1058, 1357, 1989
+1889 <-> 1227, 1796, 1889
+1890 <-> 576
+1891 <-> 516, 583, 931, 1280
+1892 <-> 132, 1035
+1893 <-> 440
+1894 <-> 478, 617, 1313
+1895 <-> 1091, 1325, 1842
+1896 <-> 1540
+1897 <-> 71, 1536
+1898 <-> 1110
+1899 <-> 613, 1870
+1900 <-> 1644
+1901 <-> 704, 1259, 1536
+1902 <-> 1902
+1903 <-> 864
+1904 <-> 639, 1434
+1905 <-> 41, 757
+1906 <-> 390
+1907 <-> 1749
+1908 <-> 766
+1909 <-> 997
+1910 <-> 1818
+1911 <-> 665, 1911
+1912 <-> 244, 328, 590, 761, 1574
+1913 <-> 426
+1914 <-> 428, 1650, 1941
+1915 <-> 1796
+1916 <-> 260, 1924
+1917 <-> 1917
+1918 <-> 235, 1232
+1919 <-> 919, 1475, 1589
+1920 <-> 230, 1159
+1921 <-> 784, 1749
+1922 <-> 9, 1928
+1923 <-> 347, 1128, 1923
+1924 <-> 121, 1916
+1925 <-> 1292, 1855
+1926 <-> 43, 1338
+1927 <-> 113, 635, 1074, 1092
+1928 <-> 1922
+1929 <-> 945
+1930 <-> 1099
+1931 <-> 914, 1669
+1932 <-> 200, 874, 1091, 1188
+1933 <-> 828
+1934 <-> 1090
+1935 <-> 1775
+1936 <-> 1826
+1937 <-> 811
+1938 <-> 23, 1044, 1862
+1939 <-> 1170
+1940 <-> 136, 250, 1267
+1941 <-> 1914
+1942 <-> 197, 612
+1943 <-> 226, 788, 1626
+1944 <-> 48, 445, 1542
+1945 <-> 995, 1586
+1946 <-> 574
+1947 <-> 828, 876, 1786
+1948 <-> 654, 1660, 1818
+1949 <-> 478, 1879
+1950 <-> 263
+1951 <-> 822, 1174, 1242
+1952 <-> 239
+1953 <-> 190
+1954 <-> 1360
+1955 <-> 701, 1006
+1956 <-> 138, 715, 1095
+1957 <-> 925
+1958 <-> 1203, 1703, 1777
+1959 <-> 1959
+1960 <-> 1287
+1961 <-> 202, 574, 1597
+1962 <-> 489, 1482
+1963 <-> 1436
+1964 <-> 443, 1083, 1844
+1965 <-> 639
+1966 <-> 1100
+1967 <-> 674
+1968 <-> 1424
+1969 <-> 354
+1970 <-> 169, 1002
+1971 <-> 1077, 1971
+1972 <-> 252, 530, 1582, 1794, 1818
+1973 <-> 1250, 1297
+1974 <-> 1413, 1596
+1975 <-> 261, 1608
+1976 <-> 1561
+1977 <-> 321, 923, 1261
+1978 <-> 843, 977, 1375
+1979 <-> 547, 1662
+1980 <-> 276, 1505
+1981 <-> 403
+1982 <-> 69, 907
+1983 <-> 273, 1780
+1984 <-> 20, 627, 980
+1985 <-> 80, 400, 1626
+1986 <-> 1196
+1987 <-> 894, 1033, 1056
+1988 <-> 548
+1989 <-> 326, 358, 1888
+1990 <-> 1432, 1990
+1991 <-> 924, 1782
+1992 <-> 80
+1993 <-> 31, 867
+1994 <-> 1860
+1995 <-> 301, 1389, 1399
+1996 <-> 968
+1997 <-> 952, 1568
+1998 <-> 1522, 1577, 1790
+1999 <-> 308, 799, 1013

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2017/13.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,44 @@
+0: 5
+1: 2
+2: 3
+4: 4
+6: 6
+8: 4
+10: 8
+12: 6
+14: 6
+16: 14
+18: 6
+20: 8
+22: 8
+24: 10
+26: 8
+28: 8
+30: 10
+32: 8
+34: 12
+36: 9
+38: 20
+40: 12
+42: 12
+44: 12
+46: 12
+48: 12
+50: 12
+52: 12
+54: 12
+56: 14
+58: 14
+60: 14
+62: 20
+64: 14
+66: 14
+70: 14
+72: 14
+74: 14
+76: 14
+78: 14
+80: 12
+90: 30
+92: 17
+94: 18

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2019/02.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,13,19,1,9,19,23,2,13,23,27,2,27,13,31,2,31,10,35,1,6,35,39,1,5,39,43,1,10,43,47,1,5,47,51,1,13,51,55,2,55,9,59,1,6,59,63,1,13,63,67,1,6,67,71,1,71,10,75,2,13,75,79,1,5,79,83,2,83,6,87,1,6,87,91,1,91,13,95,1,95,13,99,2,99,13,103,1,103,5,107,2,107,10,111,1,5,111,115,1,2,115,119,1,119,6,0,99,2,0,14,0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2019/03.txt	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,2 @@
+R992,U284,L447,D597,R888,D327,R949,U520,R27,U555,L144,D284,R538,U249,R323,U297,R136,U838,L704,D621,R488,U856,R301,U539,L701,U363,R611,D94,L734,D560,L414,U890,R236,D699,L384,D452,R702,D637,L164,U410,R649,U901,L910,D595,R339,D346,R959,U777,R218,D667,R534,D762,R484,D914,L25,U959,R984,D922,R612,U999,L169,D599,L604,D357,L217,D327,L730,D949,L565,D332,L114,D512,R460,D495,L187,D697,R313,U319,L8,D915,L518,D513,R738,U9,R137,U542,L188,U440,R576,D307,R734,U58,R285,D401,R166,U156,L859,U132,L10,U753,L933,U915,R459,D50,R231,D166,L253,U844,R585,D871,L799,U53,R785,U336,R622,D108,R555,D918,L217,D668,L220,U738,L997,D998,R964,D456,L54,U930,R985,D244,L613,D116,L994,D20,R949,D245,L704,D564,L210,D13,R998,U951,L482,U579,L793,U680,L285,U770,L975,D54,R79,U613,L907,U467,L256,D783,R883,U810,R409,D508,L898,D286,L40,U741,L759,D549,R210,U411,R638,D643,L784,U538,L739,U771,L773,U491,L303,D425,L891,U182,R412,U951,L381,U501,R482,D625,R870,D320,L464,U555,R566,D781,L540,D754,L211,U73,L321,D869,R994,D177,R496,U383,R911,U819,L651,D774,L591,U666,L883,U767,R232,U822,L499,U44,L45,U873,L98,D487,L47,U803,R855,U256,R567,D88,R138,D678,L37,U38,R783,U569,L646,D261,L597,U275,L527,U48,R433,D324,L631,D160,L145,D128,R894,U223,R664,U510,R756,D700,R297,D361,R837,U996,L769,U813,L477,U420,L172,U482,R891,D379,L329,U55,R284,U155,L816,U659,L671,U996,R997,U252,R514,D718,L661,D625,R910,D960,L39,U610,R853,U859,R174,U215,L603,U745,L587,D736,R365,U78,R306,U158,L813,U885,R558,U631,L110,D232,L519,D366,R909,D10,R294
+L1001,D833,L855,D123,R36,U295,L319,D700,L164,U576,L68,D757,R192,D738,L640,D660,R940,D778,R888,U772,R771,U900,L188,D464,L572,U184,R889,D991,L961,U751,R560,D490,L887,D748,R37,U910,L424,D401,L385,U415,L929,U193,R710,D855,L596,D323,L966,D505,L422,D139,L108,D135,R737,U176,R538,D173,R21,D951,R949,D61,L343,U704,R127,U468,L240,D834,L858,D127,R328,D863,R329,U477,R131,U864,R997,D38,R418,U611,R28,U705,R148,D414,R786,U264,L785,D650,R201,D250,R528,D910,R670,U309,L658,U190,R704,U21,R288,D7,R930,U62,R782,U621,R328,D725,R305,U700,R494,D137,R969,U142,L867,U577,R300,U162,L13,D698,R333,U865,R941,U796,L60,U902,L784,U832,R78,D578,R196,D390,R728,D922,R858,D994,L457,U547,R238,D345,R329,D498,R873,D212,R501,U474,L657,U910,L335,U133,R213,U417,R698,U829,L2,U704,L273,D83,R231,D247,R675,D23,L692,D472,L325,D659,L408,U746,L715,U395,L596,U296,R52,D849,L713,U815,R684,D551,L319,U768,R176,D182,R557,U731,R314,D543,L9,D256,R38,D809,L567,D332,R375,D572,R81,D479,L71,U968,L831,D247,R989,U390,R463,D576,R740,D539,R488,U367,L596,U375,L763,D824,R70,U448,R979,D977,L744,D379,R488,D671,L516,D334,L542,U517,L488,D390,L713,D932,L28,U924,L448,D229,L488,D501,R19,D910,L979,D411,R711,D824,L973,U291,R794,D485,R208,U370,R655,U450,L40,D804,L374,D671,R962,D829,L209,U111,L84,D876,L832,D747,L733,D560,L702,D972,R188,U817,L111,U26,L492,U485,L71,D59,L269,D870,L152,U539,R65,D918,L932,D260,L485,U77,L699,U254,R924,U643,L264,U96,R395,D917,R360,U354,R101,D682,R854,U450,L376,D378,R872,D311,L881,U630,R77,D766,R672

--- a/package.lisp	Sun Dec 01 16:01:05 2019 -0500
+++ b/package.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -7,9 +7,15 @@
     :read-lines
     :read-lines-of-words
     :read-lines-of-numbers-and-garbage
+    :read-numbers
+    :read-numbers-from-string
+    :read-comma-separated-values
 
     :ensure-string
     :ensure-stream
+    :ensure-keyword
+
+    :returning
 
     :char-invertcase
     :emptyp
@@ -20,10 +26,14 @@
     :integral-range
     :manhattan-distance
     :manhattan-neighbors
+    :x
+    :y
     :nth-digit
     :unique
     :positions-if
     :digits
+    :fresh-vector
+    :let-result
 
     :ring
     :ring-prev

--- a/src/2017/day-05.lisp	Sun Dec 01 16:01:05 2019 -0500
+++ b/src/2017/day-05.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -1,14 +1,9 @@
 (defpackage :advent/2017/05 #.cl-user::*advent-use*)
 (in-package :advent/2017/05)
 
-(defun fresh-simple-vector (sequence)
-  (if (typep sequence 'simple-vector)
-    (copy-seq sequence)
-    (coerce sequence 'simple-vector)))
-
 (defun compute (data modification-function)
   (iterate
-    (with maze = (fresh-simple-vector data))
+    (with maze = (fresh-vector data))
     (with bound = (1- (length maze)))
     (with address = 0)
     (while (<= 0 address bound))

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2017/day-10.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,52 @@
+(defpackage :advent/2017/10 #.cl-user::*advent-use*)
+(in-package :advent/2017/10)
+
+(defun reverse-chunk (vector start length)
+  (iterate
+    (repeat (truncate length 2))
+    (for i :modulo (length vector) :from start)
+    (for j :modulo (length vector) :downfrom (+ start (1- length)))
+    (rotatef (aref vector i) (aref vector j))))
+
+(defun simple-knot-hash (lengths)
+  (iterate
+    (with numbers = (coerce (alexandria:iota 256) 'vector))
+    (with current = 0)
+    (with skip = 0)
+    (for length :in lengths)
+    (reverse-chunk numbers current length)
+    (zapf current (mod (+ % length skip) 256))
+    (incf skip)
+    (finally (return (* (aref numbers 0) (aref numbers 1))))))
+
+(defun sparse->dense (numbers)
+  (iterate
+    (for i :from 0 :by 16 :below (length numbers))
+    (collect (reduce #'logxor numbers :start i :end (+ i 16)))))
+
+(defun bytes->hex (bytes)
+  (format nil "~(~{~2,'0X~}~)" bytes))
+
+(defun initial-lengths (string)
+  (append (map 'list #'char-code string)
+          (list 17 31 73 47 23)))
+
+(defun full-knot-hash (string)
+  (iterate
+    (with lengths = (initial-lengths string))
+    (with numbers = (coerce (alexandria:iota 256) 'vector))
+    (with current = 0)
+    (with skip = 0)
+    (repeat 64)
+    (iterate
+      (for length :in lengths)
+      (reverse-chunk numbers current length)
+      (zapf current (mod (+ % length skip) 256))
+      (incf skip))
+    (finally (return (bytes->hex (sparse->dense numbers))))))
+
+(define-problem (2017 10) (data alexandria:read-stream-content-into-string) ()
+  (values
+    (simple-knot-hash (read-numbers-from-string data))
+    (full-knot-hash (str:trim data))))
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2017/day-11.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,21 @@
+(defpackage :advent/2017/11 #.cl-user::*advent-use*)
+(in-package :advent/2017/11)
+
+;; https://www.redblobgames.com/grids/hexagons/#coordinates
+
+(defun coord+ (c1 c2)
+  (map 'vector #'+ c1 c2))
+
+(defun coord- (c1 c2)
+  (map 'vector #'- c1 c2))
+
+(defun distance (c1 &optional (c2 #(0 0 0)))
+  (/ (reduce #'+ (coord- c1 c2) :key #'abs) 2))
+
+(define-problem (2017 11) (data read-comma-separated-values) (773 1560)
+  (iterate
+    (with pos = #(0 0 0))
+    (for direction :in (mapcar #'ensure-keyword data))
+    (setf pos (coord+ pos (delta direction)))
+    (maximizing (distance pos) :into furthest)
+    (finally (return (values (distance pos) furthest)))))

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2017/day-12.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,36 @@
+(defpackage :advent/2017/12 #.cl-user::*advent-use*)
+(in-package :advent/2017/12)
+
+(defun parse-line (line)
+  (destructuring-bind (id others) (str:split "<->" line)
+    (list (parse-integer id)
+          (mapcar #'parse-integer (str:split #\, others)))))
+
+(defun build-graph (records)
+  (iterate
+    (with graph = (digraph:make-digraph :initial-vertices (mapcar #'car records)))
+    (for (id others) :in records)
+    (dolist (id2 others)
+      (digraph:insert-edge graph id id2))
+    (finally (return graph))))
+
+(defun connected-to (graph start)
+  (gathering
+    (digraph:mapc-depth-first #'gather graph start)))
+
+(defun count-subgraph (graph start)
+  (length (connected-to graph start)))
+
+(defun remove-subgraph (graph start)
+  (map nil (alexandria:curry #'digraph:remove-vertex graph)
+       (connected-to graph start)))
+
+(define-problem (2017 12) (data read-lines) (141 171)
+  (let ((graph (build-graph (mapcar #'parse-line data))))
+    (values
+      (count-subgraph graph 0)
+      (iterate
+        (for vertex = (digraph:arbitrary-vertex graph))
+        (while vertex)
+        (remove-subgraph graph vertex)
+        (counting t)))))

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2017/day-13.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,68 @@
+(defpackage :advent/2017/13 #.cl-user::*advent-use*)
+(in-package :advent/2017/13)
+
+;; There's a magical insight that you need to get if you want to do this
+;; problem: the length of a scanner of range R is `2(R-1)`.
+;;
+;; Examples:
+;;
+;;     R = 2: S.     1
+;;            .S     2 = 2(R-1) = 2(2-1) = 2(1) = 2
+;;
+;;     R = 3: S..    1
+;;            .S.    2
+;;            ..S    3
+;;            .S.    4 = 2(R-1) = 2(3-1) = 2(2) = 4
+;;
+;;     R = 4: S...   1
+;;            .S..   2
+;;            ..S.   3
+;;            ...S   4
+;;            ..S.   5
+;;            .S..   6 = 2(R-1) = 2(4-1) = 2(3) = 6
+;;
+;; The best "intuition" I can come up with for this is:
+;;
+;; * We spend 1 turn at each end position.
+;; * We spend 2 turns at each inner position.
+;; * We have R positions, 2 of which are an end and (R-2) of which are inner.
+;; * So we have (2 * 1) + ((R-2) * 2) = 2 + 2(R-2) turns.
+;; * Factor out the 2 and simplify: 2(1 + (R-2)) = 2(R-1).
+;;
+;; Figuring out the exact position of a scanner at a given time it tricky
+;; because you need to wrap the position around properly during the second half,
+;; but we can skip that because all we care about is whether it's at zero.
+
+(defun catchesp (range time)
+  (zerop (mod time (* (1- range) 2))))
+
+(defun make-scanners (specs)
+  (iterate
+    (with scanners = (make-array (1+ (caar (last specs))) :initial-element nil))
+    (for (level range) :in specs)
+    (setf (aref scanners level) range)
+    (finally (return scanners))))
+
+(defun severity (level range)
+  (* level range))
+
+(defun traverse (scanners start-time)
+  (iterate
+    (for level :from 0)
+    (for time :from start-time)
+    (for range :in-vector scanners)
+    (for caught = (and range (catchesp range time)))
+    (oring caught :into ever-caught)
+    (when caught
+      (summing (severity level range) :into score))
+    (returning score ever-caught)))
+
+(define-problem (2017 13) (data read-lines-of-numbers-and-garbage)
+    (2604 3941460)
+  (let ((scanners (make-scanners data)))
+    (values
+      (traverse scanners 0)
+      (iterate
+        (for delay :from 0)
+        (for (values score caught) = (traverse scanners delay))
+        (finding delay :such-that (not caught))))))

--- a/src/2018/day-10.lisp	Sun Dec 01 16:01:05 2019 -0500
+++ b/src/2018/day-10.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -1,4 +1,5 @@
-(defpackage :advent/2018/10 #.cl-user::*advent-use*)
+(defpackage :advent/2018/10 #.cl-user::*advent-use*
+  (:shadow :x))
 (in-package :advent/2018/10)
 
 (defun parse-line (line)

--- a/src/2018/day-11.lisp	Sun Dec 01 16:01:05 2019 -0500
+++ b/src/2018/day-11.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -1,4 +1,5 @@
-(defpackage :advent/2018/11 #.cl-user::*advent-use*)
+(defpackage :advent/2018/11 #.cl-user::*advent-use*
+  (:shadow :x :y))
 (in-package :advent/2018/11)
 
 (defun cell (x y)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2019/day-02.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,30 @@
+(defpackage :advent/2019/02 #.cl-user::*advent-use*)
+(in-package :advent/2019/02)
+
+(defun run-intcode (memory a b)
+  (let ((memory (fresh-vector memory)))
+    (macrolet ((m (addr &rest deltas)
+                 `(aref memory (+ ,addr ,@deltas))))
+      (iterate
+        (initially (setf (m 1) a
+                         (m 2) b))
+        (with pc = 0)
+        (for op   = (m pc))
+        (for x    = (m (m pc 1)))
+        (for y    = (m (m pc 2)))
+        (for dest = (m pc 3))
+        (ecase op
+          (1 (setf (m dest) (+ x y)))
+          (2 (setf (m dest) (* x y)))
+          (99 (return (m 0))))
+        (incf pc 4)))))
+
+(define-problem (2019 2) (data read-numbers) ()
+  (values
+    (run-intcode data 12 2)
+    (iterate
+      (for-nested ((a :from 0 :to 99)
+                   (b :from 0 :to 99)))
+      (when (= 19690720 (run-intcode data a b))
+        (return (+ (* 100 a) b))))))
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2019/day-03.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -0,0 +1,92 @@
+(defpackage :advent/2019/03 #.cl-user::*advent-use*)
+(in-package :advent/2019/03)
+
+(defun bounds (grid)
+  (multiple-value-bind (bottom top)
+      (losh:extrema #'< (alexandria:hash-table-keys grid) :key #'y)
+    (multiple-value-bind (left right)
+        (losh:extrema #'< (alexandria:hash-table-keys grid) :key #'x)
+      (values (x left)
+              (x right)
+              (y top)
+              (y bottom)))))
+
+(defun print-grid (grid)
+  (multiple-value-bind (left right top bottom) (bounds grid)
+    (iterate
+      (for y :from (1+ top) :downto (1- bottom))
+      (iterate
+        (for x :from (1- left) :to (1+ right))
+        (princ (gethash (complex x y) grid #\.)))
+      (terpri))))
+
+(defun first-character (string)
+  (aref string 0))
+
+(defun parse-path (string)
+  (gathering
+    (ppcre:do-register-groups
+        ((#'first-character direction) (#'parse-integer distance))
+        ("([UDLR])(\\d+)" string)
+      (gather (cons direction distance)))))
+
+(defun delta (direction)
+  (ecase direction
+    (#\U #c( 0  1))
+    (#\D #c( 0 -1))
+    (#\L #c(-1  0))
+    (#\R #c( 1  0))))
+
+(defun place-wire (grid path label)
+  (iterate
+    (with scores = (make-hash-table))
+    (with steps = 0)
+    (with pos = #c(0 0))
+    (for (direction . distance) :in path)
+    (for delta = (delta direction))
+    (iterate
+      (repeat distance)
+      (incf pos delta)
+      (incf steps)
+      (for cur = (gethash pos grid))
+      (cond ((null cur) (setf (gethash pos grid) label ; never seen anything
+                              (gethash pos scores) steps))
+            ((char= cur label)) ; already seen
+            ((char= cur #\X)) ; already seen
+            (t (setf (gethash pos grid) #\X ; seen the other wire
+                     (gethash pos scores) steps))))
+    (finally (return scores))))
+
+(defun find-intersections (grid)
+  (iterate (for (k v) :in-hashtable grid)
+           (when (eql #\X v) (collect k))))
+
+(defun make-grid ()
+  (let-result (grid (make-hash-table))
+    (setf (gethash #c(0 0) grid) #\o)))
+
+(define-problem (2019 3) (data read-lines) (5357 101956)
+  (let* ((path1 (parse-path (first data)))
+         (path2 (parse-path (second data)))
+         (grid (make-grid))
+         (scores1 (place-wire grid path1 #\1))
+         (scores2 (place-wire grid path2 #\2))
+         (intersections (find-intersections grid)))
+    (flet ((intersection-cost (point)
+             (+ (gethash point scores1)
+                (gethash point scores2))))
+      (values
+        (alexandria:extremum (mapcar #'manhattan-distance intersections) #'<)
+        (alexandria:extremum (mapcar #'intersection-cost intersections) #'<)))))
+
+;; (run '("R8,U5,L5,D3" "U7,R6,D4,L4"))
+;; (run '(
+;; "R75,D30,R83,U83,L12,D49,R71,U7,L72"
+;; "U62,R66,U55,R34,D71,R55,D58,R83"
+;;        ))
+
+;; (run '(
+;; "R98,U47,R26,D63,R33,U87,L62,D20,R33,U53,R51"
+;; "U98,R91,D20,R16,D67,R40,U7,R15,U6,R7"
+
+;;        ))

--- a/src/utils.lisp	Sun Dec 01 16:01:05 2019 -0500
+++ b/src/utils.lisp	Tue Dec 03 20:15:07 2019 -0500
@@ -25,6 +25,13 @@
     (stream (alexandria:read-stream-content-into-string input))
     (string (copy-seq input))))
 
+(defun ensure-keyword (input)
+  (values
+    (ctypecase input
+      (keyword input)
+      (symbol (alexandria:make-keyword input))
+      (string (alexandria:make-keyword (string-upcase (str:trim input)))))))
+
 
 ;;;; Problems -----------------------------------------------------------------
 (defmacro define-problem-tests ((year day) part1 part2)
@@ -50,7 +57,8 @@
              ,@declarations
              (let ((,file (unless ,arg (open (problem-data-path ,year ,day)))))
                (unwind-protect
-                   (progn (setf ,arg (,reader (ensure-stream (or ,arg ,file))))
+                   (progn (unless ,arg
+                            (setf ,arg (,reader (ensure-stream (or ,arg ,file)))))
                           ,@body)
                  (when ,file (close ,file)))))
            ,@(when answer1
@@ -66,16 +74,19 @@
 
 
 ;;;; Readers ------------------------------------------------------------------
-(defun read-numbers-from-line (line)
+(defun read-numbers-from-string (line)
   (mapcar #'parse-integer (ppcre:all-matches-as-strings "-?\\d+" line)))
 
 (defun read-and-collect (stream reader)
   (iterate (for value :in-stream stream :using reader)
            (collect value)))
 
+
 (defun read-all (stream)
   "Read all forms from `stream` and return them as a fresh list."
   (read-and-collect stream #'read))
+(defun read-numbers (stream)
+  (read-numbers-from-string (alexandria:read-stream-content-into-string stream)))
 
 (defun read-lines (stream)
   "Read all lines from `stream` and return them as a fresh list of strings."
@@ -90,7 +101,7 @@
 
   "
   (iterate (for line :in-stream stream :using #'read-line)
-           (for numbers = (read-numbers-from-line line))
+           (for numbers = (read-numbers-from-string line))
            (when numbers
              (collect numbers))))
 
@@ -98,6 +109,9 @@
   (mapcar (lambda (line) (split-sequence:split-sequence #\space line))
           (read-lines stream)))
 
+(defun read-comma-separated-values (stream)
+  (str:split #\, (alexandria:read-stream-content-into-string stream)))
+
 
 ;;;; Rings --------------------------------------------------------------------
 (declaim (inline ring-prev ring-next ring-data))
@@ -213,6 +227,11 @@
                (return start)))))
 
 
+;;;; Iterate ------------------------------------------------------------------
+(defmacro returning (&rest values)
+  `(finally (return (values ,@values))))
+
+
 ;;;; Miscellaneous ------------------------------------------------------------
 (defun hash-table= (h1 h2 &optional (test #'eql))
   "Return whether `h1` and `h2` have the same keys and values.
@@ -303,12 +322,18 @@
     (char-upcase char)
     (char-downcase char)))
 
-(defun manhattan-distance (point1 point2)
+(defun-inline x (point)
+  (realpart point))
+
+(defun-inline y (point)
+  (imagpart point))
+
+(defun manhattan-distance (point1 &optional (point2 #c(0 0)))
   "Return the Manhattan distance between the two points on the complex plane."
-  (+ (abs (- (realpart point1)
-             (realpart point2)))
-     (abs (- (imagpart point1)
-             (imagpart point2)))))
+  (+ (abs (- (x point1)
+             (x point2)))
+     (abs (- (y point1)
+             (y point2)))))
 
 (defun manhattan-neighbors (point)
   "Return points adjacent to point (excluding diagonals) on the complex plane."
@@ -403,6 +428,31 @@
     result-type))
 
 
+(defun fresh-vector (sequence)
+  (if (typep sequence 'vector)
+    (copy-seq sequence)
+    (coerce sequence 'vector)))
+
+
+(defmacro let-result ((symbol initform) &body body)
+  "Bind `symbol` to initform, execute `body`, and return `symbol`.
+
+  This is useful for creating a object, doing some work on it, and returning the
+  object.  For example:
+
+    (let-result (table (make-hash-table))
+      (setf (gethash 0 table) 'foo))
+    ; ==>
+    (let ((table (make-hash-table)))
+      (setf (gethash 0 table) 'foo)
+      table)
+
+  "
+  `(let ((,symbol ,initform))
+     ,@body
+     ,symbol))
+
+
 ;;;; A* Search ----------------------------------------------------------------
 (defstruct path
   state