day 19

aoc/str.h

@@ -41,6 +41,7 @@ void str_print(str s);
 #ifdef STR_IMPLEMENTATION
 
 #include <stdio.h>
+#include <string.h>
 
 str make_str(uint8_t *data, size_t len) {
     return (str) { .data = data, .len = len };
@@ -108,25 +109,14 @@ bool str_starts_with(str s, str prefix) {
     if (prefix.len > s.len) {
         return false;
     }
-    for (size_t index = 0; index < prefix.len; ++index) {
+    return memcmp(s.data, prefix.data, prefix.len) == 0;
-        if (s.data[index] != prefix.data[index]) {
-            return false;
-        }
-    }
-    return true;
 }
 
 bool str_ends_with(str s, str suffix) {
     if (suffix.len > s.len) {
         return false;
     }
-    size_t offset = s.len - suffix.len;
+    return memcmp(s.data + s.len - suffix.len, suffix.data, suffix.len) == 0;
-    for (size_t index = 0; index < suffix.len; ++index) {
-        if (s.data[offset + index] != suffix.data[index]) {
-            return false;
-        }
-    }
-    return true;
 }
 
 bool str_empty(str s) {

day-19/input.txt

@@ -0,0 +1,402 @@
+rbrr, gbgrgrg, rgurwgb, grb, ggg, grbugw, brwggrw, rbbrub, grguuu, uuub, uw, urug, bru, wwrrb, rbwbb, urw, uwuw, ubg, uugug, wbub, guubr, rru, gwb, wggrg, gubbwww, wrr, wbw, grug, brrr, rgw, urg, gugg, rugwuwb, rwu, rgu, bbu, ubb, gr, wwwggw, ub, uggrb, bbwrru, wuwrww, gbrbwru, uubu, bub, uguub, b, uwgu, brggrr, rruuggrr, buuu, brbgw, wbugb, rbwru, wrgu, bbg, uwbg, ruwg, bgugub, urwrrb, bggugw, bg, rgrrb, guwwu, gbbr, rwb, urrgu, brw, gbrwg, gbgwwrb, grgb, ggug, ugw, wbwwbug, wrbru, uwww, wwuw, wubg, burubw, gwr, wwubu, ubggrr, uru, www, wwr, uwbw, ww, rbbrwbr, rrwgru, gwuwgug, wubwww, gwbbwwb, bwu, ubr, rrguwr, bu, g, wrwbr, ggwb, wbr, uubwbrrg, gubrurwu, ugbg, wrurwbwr, buu, wuwbgrbw, ruw, wwgrw, bbbr, wbg, grrrrbu, wguuggwb, wrrwr, rbrru, bur, wurgwbgw, wgr, burggw, grugug, uugbrg, bgurgrr, urbw, gurur, wggb, rrub, uwgwg, grrug, uuu, gurg, ugugg, rurb, bbb, rrggwwb, brwbb, rrbub, ugb, wwbgg, gbguw, wgwgbb, wgw, brrw, ugbwrg, wgub, uub, bwgrugwb, guwgg, gurw, rrruwr, wgg, bgw, wrub, bubrw, uwrbb, uubugbwg, bwr, ugg, gwrbg, gbg, rbuwr, gububbu, bbw, wggw, rwrww, bbggbr, urgburg, rwbgr, rgr, wbugu, uug, uwg, ubgruurb, r, uu, rrw, uuwgu, gbu, urb, ugwg, bgrgrrg, rub, wubgwbg, brgubr, uuuburb, rbrwgr, wgwur, wbu, buurrgw, uwu, wbgb, rgru, wgggg, gubbr, uubwwg, uurbbggg, bgrwg, wggburr, ubwrg, wu, urbu, wbwrur, urgu, bggub, gbuwbb, uruu, gwwggwu, wugubrbr, bgrb, rgrbrb, guw, brr, rbguu, bgb, rug, gbur, gbb, rbrwbbb, ruuw, wrug, bbrwbgu, wwuwwbr, bgugur, rgg, brbw, wru, burrg, gu, ggwuww, wuw, uurg, wuwwbrwr, bbgbr, wb, ug, rrru, gwbg, ubwrug, rgur, rwg, ggrr, rgbub, uwubub, rwugg, wgbw, wburr, rgbu, ugr, ggwwb, gg, bbrbwgrw, gwu, brgwrwb, bguw, bbwwurr, ruu, ggbbu, ggr, bgwbgr, gru, gguuw, rbg, urbb, grw, wrwubbg, wbuu, ubwuw, gug, rbbr, wwb, buw, gw, buuw, wurgbuu, u, uuw, rwbw, wbbguw, bww, urguuwr, buwb, rugguggb, wwub, wrgubb, wrbr, gubbrw, guugr, ubbu, rwwbrb, bw, uwur, uugugw, bb, grr, wwuu, grrggg, rur, burugrr, ggb, rr, grg, brgw, wbwgu, uruwb, wuu, bwwgwrb, urgg, rrwuru, wurbur, uwb, bwrb, wur, ruwbwug, gb, bbr, uuwguu, ggwgwggw, bgurbb, wrw, rrbu, ubu, wbrgr, ruug, rbrg, rbr, bubwb, wbwgbwb, urugww, wrgbw, wgb, grub, gwrbuu, rbb, rrb, wbb, gguw, ggurrwg, bgwg, uuurw, wrwuww, brg, gbuub, uuur, rwrwu, wgu, rrrw, rbw, bwrbr, gwrgwu, ubbruu, rurrbrg, wwbwb, ubrg, wbbb, brb, rgwgr, gwg, brrgb, rwub, guwburb, buwgbru, ugbug, bwb, wgbwuu, wrbg, rrwugb, guuub, burw, brgwbwb, ubrub, ggbb, wggww, buwwwwuw, gur, ugu, guu, gwrbbrug, wbggu, gbgbuu, gbr, ggub, bbwg, ugwuur, grgr, ubguu, urgw, ru, bgg, wwu, buggg, gbuu, uuwu, rrww, ugrw, urr, rbu, bbugb, rgb, uwrbbu, wrwguu, rw, wwwu, gbbbuguw, wbrwwg, gbbrwrwr, wugw, rrbb, wurg, wgbubg, wug, wwwwg, br, rwbg, ur, rrrggg, gbw, ggu, bwrwb, rrr, rguuww, wuwbgww, bug, wgwru, wgbggw, uww, bwg, ggw, ubw, rrg, wg, uur, uwr, wrb, bwurbg, ugur, rb, gww, ubuu, burr, ggwg, rwr, gwuww, bgbwu, gub, bgu, wwgr, wwgb, bbrug
+
+wwugguwgrwwbrwubrwrwburubgrwubbbrugbggwrbwrwwrgggg
+brwwgggrrubuwubbgbgruwgwguguwgwwugrgbwbgrbbwwuwwruug
+gruurgurbugwgwbwuwubrggrgbgguurgrugbuubwgwrguwggwburrrgu
+ugbrrgrwgbuggrrwuwwwbwugwwgbbrbuugbwbwbrrggwgruurrguuguw
+grgggbwuuggwbbugrburbbbbbbbgwubbruuggubbgrggurg
+wrggrurwbubuwwbrbrrurgrrrbuggwgbbgbbwgbwbbrgugruug
+ugrrrrwggbbuuubrbggrgurggruurgrburbrgubrwrwgbwwwuugbwwuw
+ggwrrwwrbbrrbwrgrwuurrbbwubgugruurbrggrrbr
+rrurruguurburuwubwugurrrwgwgubbbwuurbggrwruuwg
+gwbgrrggwbgbwrgwurbubgrwubwrgbugurbrbbrbrb
+rwburrrbrwggbgwbruuwrwrrurwwuwwbugguwwrurwbwrrbu
+uwruuuuwrwrwrrgurrubuwgwgrwbwuubgrwrbugubbbbuwbr
+rwwggwwurwwrrrbwrwwwugbrggruwgruggwbwwgguuuuwurbrgbu
+rwgbgwbgburuwubrbgrwrwubrrbrgubbwrgwbrbrugbbubbwurgu
+ugbbbubgbbuwbwrwgbgbggurbggrwbgubbwuwbbrwgrubbg
+wwbwbrggbrburubwgrwgbgrgwuruwrwwrgubwgurrbwrrwurwuurgggwgg
+wuwgbwrbbgguwgwurgwbrgbwguwrbwuugubuubuuwgbwrr
+ruuwuugwuuggbbwbuurguuwwgbwbgbgwbwwgwwuugugbbwwwruwuubrrgw
+wwbgrburbbwurgruwugbrgggrgwwggbbgwgurbbgubugbgwubwg
+wrggbbruuwrrbgrbwbuuubrruwgrwrrrgrwgwbbw
+rgbugwrgwwurbgwubwruwwbrwggbwruubwbbrrwubrgwurrrrugbgg
+buurwgrwgwbbugwgbuwbwurbwbggrugbbbwwbwrbwgrwurwubrgbrbbgu
+rwwururugbgubrwubrrggbwwbgbrgrrbbuurbugwbgwuurgbuubrgu
+bwgwruwwrbwgrgggrgwbruguwrubbrrgugbrbruwbug
+bwwrurburbbwbuubrrwwuwubwrburrwuggrbbuwwggb
+gbwuuuruuwguuwwbuwguuuuwgwuuugubbggrbuuuwb
+uuwrwrwwbrubgbrrwbrbuuuwrrggbrrgwuugbuurrbbu
+wubggwugrugbubgrbwwgbburbuuuwwbbwuuguggruugbuwwwbwrwbww
+gggwbuwrugwruurgubrugrrrubbwwguwurbwbrgbwgwwgug
+wrgguwwbbgbggubbuugbgrrbrurwuguwguuggwbwwrggww
+ubrruwrbuuggwuuwbrwgbguurbwbbgrrwurbbbgrwbubgwubgbrwgbbrb
+ugrgrwbrgwgwrrwbrwwugrruwrgrgwrurbbgurrbwwrruruwbbbrbrugu
+wbrgrubuugggruwwrwbuwgwgurugurbbgwwuggbwgrugwubr
+uugwugbububwrrgwwrrguruwwgwgbgugwgbrrwgrubbrwrrrbgwr
+rgwuugbwbwurggurrbrbuwggwwbbgwrbbrugwbggwggwuurg
+wgrrrurwgrgbwuwrggrbbgwgurugruwwugbuuruurub
+buwgubbgbwwgbwwrrggwwrrbwgwwgrugbbguwwwwgbwuwuuuururgur
+rburrbgwwwwgrrurbruwwbwbbwrwgubguwbbubwbgguruggruuugubbwu
+grbgurbbgguubrrwbrwwgrwrwwubbubbbugwwgurwgwgrbwww
+wrgbggrgrwggwuuwbrgwurgurrbwbbwrbgwuurwgrgw
+gbwwubwgrwuguwggbgrgrwwgugbuuwbuuwruwwgbbb
+ugrwwrrgwrguwgbbrbguugbbgbgbbbggbrubbbbrbguwwgu
+guggrgugguuubwwgruwwuggbugwbwwwururgbwwwrggrgbugubgubg
+rrgwrbggggbgwgggubrugrrbgrwwwuggbwwrgurwwuubgwrww
+bgbuuwgwgrgwwggrggrbwurguuururwrbbwuuwbwgugbbgwr
+bgbbrbgbrugrggrbwgurbgwwbbrurguwrbrwwwwwbbggrwbgrwwwbw
+ruwbbgburgrbrbwrrbwwwuwggguruubbbrugbgbbrurbugrubgwgur
+ubrgguggrwgrbrgrrbwrrrgrgbrruwgwrurugbgubb
+wuggrwwgrgwwwbgwwuubrggwuuwbubgbrgbuwurubbwbuwwbw
+grwbwruuggubgurrbrrwguggbwrubwwuuubbbgggwururw
+guurbugubbwbgrruggubbgrurgggwugugrrubgbruububgubgubu
+uubwwbgrurgrrurwbgwgwurguuuwguuwbwbuurbrgrgbuubgwbwbbgbbw
+wrggguwwwwrgbbgrwrbwbgbbuguurrgbbubwbbwrbgwuwwruubrwrrgbgu
+wgwugwwrrurbgwwrgbggbgbwgbbgrgrbuwgwrwrrurw
+bbbwbbgwgurrgbuugwbbrubrgrrggurwgguwruwruggrwwrgrrgbugrub
+bbwbrbrwrwbgurgrrwrrwbbrwrwgruugwbwrwurbwbwug
+wwgwrrrgbbgguwguuggwbrruubgwrwuuuwrgbrburbu
+urgwwgwbwbgrguwguubggwuwrbuugggbwuburubbuburrgbuwb
+wrgbbwuruubwuuguubwuguwwgbuurgrgwguwbrbwwrgrggugbbbb
+uuuubuuguubugbruwwwbrbrbgrrwwurwrruwwbuuwwrbbgrurbubbubrb
+bgwurgbwrbwurgwbgwburgubuuubbbwbwwwuuwrgwugg
+wrggwubugrugugubbguwgwbrwruurrggwuwwrbbgbbbrgbb
+wruwwgbbrrgwrgrggbrugrwwwbrbwubuggugwbwuggbrwgburbwbbwubbg
+ugwuuugbwwwrurrgubbbwguurbwgwbrgrwbwugugubbug
+wrgrubuuwrgrbwbuuubgrbubbrbgrurbuuwggbgrwwgwwbwr
+uururwwbrgwwrwggwbwrrrrgbbbuugbguwuwwggrgug
+ugrwbwwrgbrbwwuuwuuurbgruwgrugbrrrbguuwubbub
+wwwbrruggbuwwgbubwggrrgugruuurrurrwgwrguwwwrrgubugww
+wrgrrgbrbggbwbubrwbrwrwbbgbwuwgbbwggwrrubgurbugguwuwuw
+grrwbggrwbuugrggwubrbguuwrurbuuwbggbgugburbrrbuwwrrggggwwu
+uubrruwgwuwbggbbuurwubwgburbuuwugbwuwurrwbrbgrbbr
+rubuubuwuuburbbbwgbrrguwgrbbrwwgbugrubbruwgrgbgrbw
+rwwwbwwguwrurbubwrurrbuurbwrubuwruggbguubgwrbugguuubrgrg
+buwuwruubbrrrwbbuwbbugrwbguuwrubwrbwwrrgugwuur
+wrrbuwuwwgwrgwgrruwrwbbwbwwruuwwuugbgrggubbbwwgb
+guwbwrwuruwrgwuguguwbuwurruwbuggwuwrwwubugb
+bgbuwwgrrwwuwrbgrgbwbrggubwwbggwwbbwwurgbuubrrwwrburwgrbb
+wwwgbrbwrwrurrgrbgwbbgrbuwwbbugwwwuwwrurbu
+wrgbrurguwgrruuggrrugurwuurrubuuguwgugurwgbrruburuu
+wuwurubwugubrbrbwgrwbuugwbbbrwggrbwwguwwrbrbr
+wrgwrggbwbwbwubrbgruurbbgggububbbgbburgurrgruwb
+bggwbbrwbgugbgrwwgbbrruuguuuruuuwgrrrrgwbr
+wrgwwrgrgbwugbgwgbgbbgrgbuwwwwuwwbubbbwg
+gggbrrgwbwbuwbrbbbrbbwuubrrwuuggurwggwrwbwbu
+rbugwwuwrbwbguwbgbgrwbwbbggwruwbuwrwwubrgbbrwurwwwb
+bwwwbuggbuurbbuwrwwrbgubwbuurbrbubwgwgugrwuwgburwbbwwbrg
+wrggrgwgbgrwubgbwgrugwbuggggurrrwbrgwwwgwwggwgu
+ggburrrgubrrgwgwgbrwugwgwgrwbbbuguwbgbrwbuuurwrbr
+urrgbwwuubwwubuurrbwwgubuuggrguwwwgbwwuguwgbugb
+buugbwgwrurbbugbrugggwrbrwwruurgurwrburgrguur
+bwugruuggubrbuuwurbbwbbruggrwwbrruugrwrguw
+wrgwubgubbuwubwruuruuuwwrurrbgrrbruuurgrbrwugbbuggww
+ugubburbrggubgrwgwguburwwburbubbrubrwrbuwb
+wrgguwubbrrwbrwuwwbrwruubwgwwwrwwgbrrwguubbwwwugugwr
+wgwuwwgrwrubrgwrgubrggggwuwrgrwwbwwbggrgbuwu
+grwbwgubgwrggwrbgrwbuugrgrburbuubbgrwwwbwgb
+bwwwbbrbwwurruuwwggrwbggrgguwrubbwbgbbgugubwbbuug
+bbggwubbgwwrbburwwwgwrbwrbgrbubbwrrrgbgbruu
+wrgwurrubgguggwgrrbugbbwbrbuurgbbrwrwrwgugwubbbubu
+wrggggwrbbrugbrubguwuggubwggugrbuurwubgbuwubwgwgugugwubwbrwu
+bwwugbwbgrrbgrrbbrbgggbwwwwggbbrbwwbbbuwgguugubrububgwwu
+ugurgbgruurwbwgrruuwwbgbrrbbbggggurruruwrubbbuu
+uwrugrrgrwbrgubrwwuwwgwgrbbgrbgbrwwuwubuwr
+ggbgwbrwuwgruwrwgrrrrwugwgbrbbuwuwwbuubwgw
+wrrrgguurbgubbgbguwruugwrbrgwbgwrrbbuwugbbrwgrbbugrgbbgwuu
+urguruuggubbwurrubuurgbgbrbgugwwrrggwwwugugg
+gugbggubuwubrgubwuwrwbgbrgbguggwrbrrgwguugu
+buwurubbbwurgrubgwgggrruwrrbbrbugggggwbwwgwwb
+wrwbbuburwrrwwururbrwgbbrbgwbbrrrbubbgrgbuggwrw
+ugubruguuwrgwububrbgrbwgbwburwgurwbuwwubuwu
+gwrgugrbgbubbwubgbrwbuwggugwurrburgwrwrugubwggwuu
+rgbrgrbggwbwuubburrurggwggguurwuwwwrwuwurbrggrgbuwrgbgwbgb
+wrggrwwbrrurbbuuwburubgruurbrgwrwgrrgrbguguuubwug
+rguwwuuwgwwubwbggbugwgrrwgbrgbgurbwgrgugurrgguggrrbuuu
+ruwubrwugurgrbruruggwbugbgrurwuuwbwrwugwgrr
+wrgbrrbgubgbgwrbwgwubuggurguburgwrruruur
+uburbrrbgbrrruwruwgwrrgrgurgrruugrruwuuugbuwburwubbrbbgw
+wrbwuggbuuwwwuuwbwuuwgwbuubuwgrggrrbgbuwgubrruuggrrruuuwub
+rwwgbrrurubuwrgwgrbgbrrbbbwbbbwrugwbubugwuwgwugwwurwgrbr
+wrrgwrggrbuuruggggwrguwbwgrubgwbguuggbgrwrgubrurwuggrwgwrb
+wwrggguurbuwbwurwwbbwwbrggwggbrbbrgugurbrbwwwrbrrggbbb
+ubbrrbbwwrugugwrggwuwwuruwuwbwguwgggwwbwrbgbwuugruw
+rggbrwgbbgwrwwrrbgwbuwwbrbrbururwgbugwwbrguuruwrbbbbwrwgu
+rguwbuwgwrrbgwbwwwuwrrbrwwwburrbbwbruwggugubbu
+rgwbgwwbugbgwruugwwrugwrrbuwgrbbwbuwubguubwbugugrwu
+ubwwgrurugbrbrgwrbgrbwruwrbwwbugrwgwrwubrgbwwrurb
+rurugbugrwuwbgrbwgbbrguwgbgugwgurbbrbuuurbwuuwwgbgg
+rruubwwwuwrrwgwugwrbgwbuugbrbwugrwwuwurguw
+wrgwwrgugrbrruurwuwgbwguwurrubwbbwurwwrgruwbgbwwrwu
+bgruuwgwrgwugrrguwugwbrbgbbbgguurwrbubgwrr
+gwrgrwurbruwgburrruuggbuwbgbwggwgurubwgurrbwuwb
+bwbugugubgubrwubrbgruwrubbrurggbgrrgubrrbuurwrrubbwurbbb
+bggwwgrbburbbubbuuburuguwubrubgbrubrrrgwwbgrrggrgggwrrgrg
+rrrgbgwbgrwuwgubbwbwgubbrgwwbwburbwguuruwwwrbrb
+wrgwbbugggruwgbwrggbbburbrgbwuuwurbugggbuggrwrbw
+wgurbubuuwrwubrrgrrbrbwrwurwbrbgrggguggwubgrgbr
+rubgwgbwbrubrbbrwwbbrrugrbbrrwuugggggwrwugbbbrb
+wrwwubrbguubrggurwrburgggruwubggwgwbrgrggrggwuubwggubgggww
+wrgwbgbrgugggburuguuwgrrrbrgrwbgubruwrwugbggubuwbbbbwwwbw
+wrgrwggbwwrgbwubrubbwbbuuggrbbugrrrbguwbrub
+grbrwgbugbgwgwbwubbuurgrgbbggwgbgbwwwrurguuubgbrwugb
+urwbbbuggwugrgggurbuwgrrwwbuubwubugbgburgwgbubwuurwuwbuw
+wwgubbuwubrgrgwguwbgrurbgwwuwbgwwgbuuuwwwwggwgrrwwwwrbrbuw
+wurwrbgrubrrbguwwwgrggwwgrgbbbbuburgruwugwrbr
+gbwgbrbrrrggrurrbrrwwrrbwwgubgwwuruwurgrrbbrwb
+gubuwgggwgwwwwuwgggwgwwugrwbggbbwbwrrwugrwuurggwbgbgrwruug
+uwrugrgbburwwbugrbwwwbbgurruwbburgrwwwgrwrwrggg
+brbgrggwububuugrwgubwubbbwwgggrgurrwwggbburgbuugw
+ggwwbgugwwggrrububbgrrrrwwbwwuuurbuuubbgwbwu
+bgruubgwurbuwrrggugwwbwrbwbgwrwugugbrwwwbburugbbguur
+bbbrggbgrrbrubugbrguwrrrruwbuwbgugwubgrugrwruugwgbuw
+wuurgrrwurwggwwguguwwurwwugguuguubbuuruwubg
+bbuuwrbwwwgggrgrrrrbgwwbwurrurubgubwburgbggrwrubgwbrw
+rwuwwbrguggwuwrruwurubguubgwburrwgugrwubwwbwgwwbbbrgrbb
+gguuggrrggbwbubgrbrrwbbubuwbrwrwgbuggbbbuuuuuwrgrrgw
+bubbrwwgbwrwwggubgwwwubgbrwubuuruuwuwgwwgruggbw
+wubburwgbbgruuubwggwurwrubwuwbrgbuuwbbguwwgrwbugbwrrgubrg
+rbwrruguuuwwbrwwwbwrwrbubwuggwurrbugwubuggrbubwrubwbwu
+uggubuwbuurrbgrugwwubwubrrburubbbgbugubrwwbuwrbu
+ubbgbbgrbuguwwbgrwwwgwubuguubruugbguuuwbrrg
+rugbbrguuruuruwgbuwrwbbubgrrbrwwbwugrwugbwuuwbwwbbwuwrg
+gbubbuubburgrbbrgubggrbbwwuwwbbrurguubgwubbubbbuu
+uggwrwuubrrwrrwurbrwrguurrugwwgruwrgwrrrbbuubgrruruwr
+wrgrwburgbugwgruburwguurbgggbgubrurwurguwwurwwrbrubbwbwr
+bbrubwwbubwuwgwgbrbwuurwrrbgguwbwbgbwuwurbbwbrgrrgwbbgw
+bwurwgwgguubrgwbguugrubbrgwrugubbgwwubruguwbrbwb
+wrgrwggurrrgwwggbgwrgrrubuubwbwrrrwggbbgbgrbwgwbgb
+wubrrwbbugrrrrbbgrbwuwwggggrrbbbwurrbuurwbuwrwgrbggu
+gwgurwruwwbbgbrurrrbrurrrgrrggbgubwbggugrwrrbuw
+wrgwwwurubgbrgwbuguubwuwurbuurwrruuggrwrrburuuur
+gubwbwuggbbguwwbgbgrgggbwggbrrrrwubwrrrruuwbgrrwguww
+wrgguwubgwwwrwwbrbgrruwbrurrrugwrrbbrgbgbw
+guwwwgrrurrwuwbwrgububgwurrbrrbgbrrwguwrrggguuugbrbbwrgw
+rwwbggrrugburbbrbguwbgwwrubwrrwwbbgurruurbggruubrgggg
+uwbgbugwrguuwurgrrgrbrwwubrrbuuwggwwwurgurgwrgrwbr
+wwgrggwgwbgrugwrggbbruurbgbbwrgruuwbbrurwb
+urbwbgwbbugbuwwrgwwwwgbbwbruwbwgwwrrrrbubrbbgurbgwuru
+wgrgrrwububgruwubgwuuwbubbgurruruwrubgrgwg
+wbbbgbbbguuuubruurugwbruwbbrbwubrgrburrrrwrrb
+wrggrugrubgrwrwgugugrrgguuwrubwwugrrbuwbw
+uwbbggrrburubbgwwrwgggwgwggwgbuwbwgburbgrrwr
+wubbgrggwrrbrbrgwrbubbruugbrwbbbugbrgguubgrgwggu
+ruuuuurgrrrrrugbbrgburubbwuugwwgbgubgubwubguuururgrwb
+bwgrugbbwbbrrwuuuruwubgwuwbrwurrrbwgurwbur
+ubgwubrburgrgrwwrrurrgguwbbwbrbwbuuuuwwwugbrwgrwguubwbrrrg
+wbrbwruwbbubbgbbgurbuurbwrggbwbgrugugwwgwwwbrburbgbbwr
+ubgbbbbgwrwgrgrguubrrgugbgugubrwbruguwbwrugwuburwwbb
+ubrwbuubwuubrrbbrurgbwubuwwbrbrruwwrgrguwrrbwgrugwbubw
+gwwruuuwurbwrwrubrwwrrbwrrggrburbgwgruwubrrwgubbbuw
+rwggugubbwgwrwbwrwrwrgwgugugguruwgwbbrwbwrggwurb
+ugubuwurgrrgugbugrrwrguwwrrurubrbrbrurbrbbwbbuuwugrg
+uuurwubugubbggwwwurbwgrgruubrwbwgguwrwwrbubbgrgrbbgubb
+wggruwbwbrwgrwrwbrbuwbrbbwrwwrbubwggrbuwuggbbrgwrgbggwwb
+wrgbgrbrgwbggbgbrwgrbbwgrgbgrubbwgbrwrwwgbbbwurgwbgwbwbrug
+urgwwbwbbrwugruuruuubgbwubgwbuwbbggwrbrggwurgrrrgbububwg
+wguubbbbgwuuuwrrguurgugrrubrguurwggburbgrwbgwuu
+uurrbwuwwuwugbgrbgwbggwbwgwbwugbbwgurubwgrrbb
+wrwrbuggbbrrwrgugrububuwggbwrbrrbbruuuggwb
+wgwwurrwuuuubuuggrgwwuurrugruwbuwgwrrrwrwbwrubugrwwuwurbgw
+wrgruubububrbwggggbbrrgrbuuuuwrgwggruwurgggwgwggwuwwwgrwgb
+ruuggwgbrwwbubuggwwugrrubuwurbgrugrwgwubgbggrbbgbwgrurwggg
+bggbrgwrwruuuuuwbbrgbrgwubbubugbguugggwwrrugrbu
+wuuwguubwwguubbwggwwwurbgbugbwwwugwwguuugrwgrwrbwbrbubbgbg
+ggrgwbwrubrwugwrgbrwurwggrguurgurwrwrrgubbbwrwg
+wrgguwwrbubgrurgwbbuwguwuwgwbwugruruwwuuuwrbrubwrgr
+bgwrrbwugrbuggrwbuwrrbrrggggruuugbrrguwubur
+wrgwbgwruwggbwuubrugbgrrwubrgbburwwrbrwrwwrbguwgur
+buwbrgrbubgubgugwrrbwbgguuwbbwuubrgrrwwgubbbgwgggugbru
+gurbrrwbbwgubrrwbwuubbuuruubbruwrwwwrrbrwrwwbrbrubb
+wrgbbwbrrwwrrwggbbwrrurgurbgwgguggubwbbbruurwrwuggg
+wrggrugrrwwbgwwwwbugbbbbrwwgggrgggwbuguurgu
+wwugrwwbbggrgwurgrrbbuwgwgurrrbgruwrwugwrr
+bwrwubrgugguububbuggubbgggugrwuburuwrwrrrgbrwbrgr
+grgggugwbuburgbggguubwbrrgrguuwwbrgggwwwrgbgugw
+ubgbbugugbrugrwuguugwbggugbbwrgrbuurwbgrbrbgubbgwuwuwgbgw
+gurbubbwgwuwwgwbrbuwugguggbgrwgggrwuwwbgbgwbg
+rbuuugbburuuubgrubrbbrwgggwbbuugrugrrbbwggwr
+wrgrwrwbwggwrwuguwrurbugwbruwbggbggrrwurruwuuruwru
+uwguwwgbgggrubggwugwbwrbrbbwbgguuwrbgggwugrbwuwrwwgrur
+rgrwrgwuwbbbrgwrrwuubgrgbwwrrgburbgbbubbgubwrburbbwuuur
+wgruurgwubgubgbwbwbgggurbgbrggrbbgwgrrwggrwwgg
+wgwbwuwwwgwrbubwbuuuwwuuuuubuwbuurrgbgbubbbuuguburwbgru
+wrgbuurwbwbwguwrrugbrrwuuububbrgwbgugubbwgugrwgwwggwuwgrgrr
+guggbbgugbwgurrwbuwruggbbubbwguuuruuwwggwrbbgruburgrrbug
+wrgwuggurgbwgrgrggwwwgbbrwwgguwgguggbbgbbugwbrruwubrrrbrwuu
+bwgbuubgrwbugwbrwuugurwgbrggbgrwrggwbrgguwbr
+rbwwgrbgwwuwbrwgurbguwwgwrgwburwbbbwgrrgubugwurrggrwuww
+ggrwruugwguuwrbgbrgbrggrwugwggbrgwgurbwgbbrbgwubuggbbrgugw
+uuwwrwrrurgbrwrgbbuguruwwuwrwrugwrgrrbburgu
+grbbgurubwbwbgrwwgruurwbbuubrwwrrbwubwuwbbbrwu
+brrwwbbuwbwrbbgrbgbbuwwbbwrwwgubuwruwbgbwrwwwggug
+wrwbgbgggruurugwbrwwgbuguuwguurbgrgrguuwwwrgu
+wbwgbubrgbuwwwwbwbuuggugggggrwbwrwgrgguwrggrbwrgrburwbubb
+ubgwwrbbwbuwrguwrrwrrwggruwbgbrwuwbubububuggbggbrwbu
+urrbwuwwwrugbugwwgwbbubgrgbburuuwgbgguguugb
+uwbugbgubgrwgbruubbrrbrwgwuubuwbwbbuwrgbwugbr
+wrgwrrrbugbgwuwbwrubwgbbbuguwrrgrrwgbbgurwwbrbbggggrrbrruwu
+rwrrwbwwggubbguuubrwrurgrbwurguuuruuwgubwgbwbrbbgbgb
+grrbrgwrwbwbbgguwgguugrwurrbwwgwgbuubgrbuwbbbgbbbuw
+rgwubwwubrrgbrwwubuguugwbbwuwgbgubgruuruubgurrgwguuggwrw
+ruwuwuwbuwrgggwgrruguwwbrbuwwgugbuuwruwbwrbgwubwu
+ubgrgrguguwwbwrwwbgwurwurrrbggrrggubgrrbuuggbgg
+wrggwgrbugwwgruwwubrubgrgggwgubbbwwwwrwurubrwrggrwwbrgwgw
+gwbggrggwbgwgbrwwuuuwbbwrwgbguwruguuugwrbgrbbrrwrurrggbb
+brrbuwguwgrbbburrubrbwburbrwbgwbbwgrrgwugrg
+wgruguruwwgbrurbugrrrwrgwbrwuuruurrwrrgwuuwgwg
+buuwrbwbubggrwugwwbuwgubbbrbbgbubrrwrbbwwrrrrrwgugurrrbbb
+rbrrburuubrwurwgguggggubgbbruwwggburwwbwrb
+ubgruruwbrgbrbugrbburuwugrurugrwbwwguwuuwuwgubgbrgwrbbggbg
+gguuuwwrgggwgurrrubggubruubbugbbuuwgrruuwguguu
+uwbwggbrbrrbuggbwwwubwwuuggwrwwrurrwbgbwuwgw
+rwwwbuurburrrwubguwgrguguubrbgwbggbwurgwug
+gbgugwbuuwuwguwugwruwwbwurguubuurbbgggbgggrrwgwbgu
+gbrrbwwbuugurwbgrrwwwwgruurgbbgwwwgrguuuwgbgbgwwrbgwr
+gbwubwugbgwwugwgguruwubwggwuruwrbbwwbggggrgurwg
+wrgwbggbrgbuwrgrggwrwbbwwuwruuwuwrgrwwuwg
+wbrwgrgbrrrwuuuuuugwwrwbrbwbuubgggrrrbwuwruggwbwwubwbrgbwb
+uurbbgrrwrbwubwwwgbrrrrugbrbrbgbubrgrwbruuwggbbwbrg
+wrgbrrugrwrugbbrbwgrwbubruuguggwuwugrgbruurbbuubwbwur
+ggrwgwgwugbggwrbwbrwwrrrbgwrbwuwgwbuuurbwwuwbgubuurwb
+wrgrrbuwgurbgubwwwwguuwggwbrbwbwwwwuuwggb
+bbrurwwuwbgggrbgwrbrbgwurrrbbggrguwuwgggbbuuwggruwwgbw
+ugggggbwgrwubrrwurwgrwwurwrrgbrurbuguwbgwwrrbgwwwwrgwrrw
+rurbgbbwgrrgwuuwugwgbubwrwruugubgruwbwwrrg
+wrgrrwggbwruuugrwurbuwwgrgururgugwuwubbgbbgrwururwrgr
+wgrrbwrwrrbgwgwwrwubgrrurbgrwruguurrruwbwbrwugwr
+gbrwwbbbuwbwwuwubwggwrrbubuwrrwbrrrbuwbbbbugwbgu
+gurwruwurbgrurgbuwwgrrrwrbrrgwrbggwwrwruggurg
+bgururwbrguubbwbwbubbbrrbrbwrbgrubgwbruwbbwwruurruurrgurru
+bgugrwbbbgrbwuwrbubwbwubggwrwrwgrrbrubggwgwruwwuwwgrbwwb
+rbguwuwrrbwbbgrrururugbwwruwwrrwbugwguggubruuuuburrguugbu
+gurbggwbggwwurggbrgbgugrbgubrgrwrrgwguubwrurrrgrbwwbugwrw
+wrgbuwbugrgwrugguggbrrrgurruuuwgbguwgburb
+gurburbuuubuwrbwrubwuugwgwbuurrbwuurbrruuburwggw
+wgguwuuwguubuwrbwwwbbguwuugwrbubwugugrwwgwwwwggurwrbru
+wggbwgwwrggruuwbrubrrgbggrgwrwrgubbwuugwwuwrggrg
+bbwbgggubbwwuwrbggwbrgguugbuuwubguuwwrgbwuruwgruwr
+wuububrwurrgwubbgrbrrgubbbubgwbrbwrwrbwurwgg
+bgbbrbwwgubwbwbgggrwbrgbbuurgwbrrwgwgruwwrguuggubrbrurwr
+rbuuwrwbuubwrwrgrggurgwrurrgubbuwuugwbgwrrw
+wrggbwurgrrubgbgwrrgbruuuuwrruruubbbgrgubbggrwbbuugg
+buggwggrgbwbgwwbguwuwrbgwrbbwwrguwwuwggurbwgurbggubrrwgg
+guuggrbbuwbrwgrurrwwwuugwbwugbuwrbgrwguuwbgubgrbbg
+uuwwwbgugguuwuggrburwwubgurwwbuugrrwgugwuu
+buurwugwrrrgggubgwwwggwwgwugurbgrgwwuuubwuggurwrrbggbguwgr
+uuwwbgggubuubgurgwurbwguwrrwgwugubruuugwuguuuwwwgwgb
+rwbgrbwrwugbbwgwrwrgubbbbwwrrguwwubbugrbbwgbg
+ugrurggwgbgwgwrruugrwugwrgggbuurwbbubuugrbgbru
+uuugugurgbwwwwrbrgbrbggrbrurrgbbbrubburbbbbrrrbbbgww
+brbburruuwuwwbgwugrrrrggbwgrbrgwugrwbwggrr
+rbbbgburbwbwgbubbrugbgwgugwgrbubggwgwwuwbuurbuurgwrugrrg
+wuuuubrgwrwwwwugugrgwbrubbbbbgwbbgbubrrbbwgwwrgg
+ubrwubuurrrwugruubggwuwbbbuuwgbuubwrrrwbrwwwwbubwgwbrwwu
+brrurgrwwrruwrrubbwuwguuuggurbwgruuurbggggguwurrg
+uuggbrwgbugguwbgrrwgwwuuwuururwwbgbgrbgbuu
+grbbbrrgwrurugbwugbwgrgbgbgubugbrurruubgrugguubrwwugwuu
+ruwbwbugbbbgggbrugrgbbwbbgrguwrwuurrrbugbugbwwgbbugb
+ruwwrrwugwwbubggrubwbbgwrbgwggbwgguuubgbgubg
+uuwwugrbbwbbbbwwwwgrbbggurubwrrbbuuubrrggbgb
+wrgrgwuruwwugubrbrruggwrbbgrrubbggrbrwbruwubgbbrrwwgrgbgubgg
+urwuuwgugwwubuwrgwbwbgbbrwrwrrrrrbuburwbrurwuuruuugbrbb
+ggrurrwubwuwbugguuruuwggwwrgrgwwbbrwubgrbggbbur
+rwuggbgubrwuuwrwrbbbgbrgwwuwrbbuwrubguuugbbgwww
+wbrwgbrubgrrwbrwrwrwwrgrrbbrwggwbrguwwbrbbwggubbrruuwgrb
+bruwgrwrrgwrbugruuubwbruuurgbwgguwwruuurwbgr
+wubrurubrubrrwbuurgrgubgwbgrrurugguggbrguurbugr
+gbrggggugguugrrrwrgrrurggwwrgubuubwurugrbbrrrgg
+gwrbugwubbuuwrggubrrubbgggggbgbggwrbrgrwgwruwbwggubug
+gwrrgubggrurrgbbugruwgbwbrrbwuwuwbggwgrrrwgrggubbgurbg
+wrggwgwgwuwbrwwbwwgrurubugubgrgubuubbgwgbggwwwg
+wwrwbbrwwrwubwwwgbwrgguwuwrguwwggurgwgbburuuwwgwrggg
+wwrbwwbbgbgbuwbwuggrbrggurbugbrwuwugrrurwbruw
+wrbgrrggbwwgwwwgbwgbbrurwugwgugurguwbrgubr
+gwrbgbgugubgbgrugbrbgrgguwggwgubugwurwbwrgwbrugwwwb
+wbgugubwwwrurggwuwuwrrwwrwgbbbuwbbbrgrrgwurw
+uuuguubwbbwwgbbwwggguubgububgrguguubwwuugwwrwbr
+rwbgrwwgwrrruwugruuubbwrbrgubgrgwgbbbwwgburbubgrg
+wgbuugbgwbgwuwwgbwgwwguwrbuwurbuwrbwwrbbrwrrrubwrgbbug
+ubuwggbwubbgrwbbbwwrrbuwwuwwwwbbubbwrwbubwgrr
+uurwrurwrbbbgwrbggbwwruguwbwgwururgugrugruggggbgwwrrurggg
+wrggurbbwgrurggubgbggbrbgbgrwbgwrwbububgrwrwgrwwubuububu
+wrbwrgggggbuwubugurguuuugbwuwuuruburgwrwuwr
+bggbgwgrrrbwbwurgwwrggbwrwgbwuwwugwbwgbrrrbgrwwgwrwgbr
+ubuguruwbrrrgbwwgrgggrruwgggrgrbgrgwubggbrbuubw
+grurrbguuubuggbbguurbwwbrrurguwurubrbgwggrguwbrrgburruugb
+wrgbgrugrwwgwbgubbwbbrwubruggruuguuwubwgwurubggrbgwurrrrr
+wrgrwuguggwwurbwubgwrbrugbruruwuurgurbbgrgr
+wbbrguggbrbgwgwrugbuwrgbrgbuurrggggbrwgwwwuubbub
+grrgwbwwbruugggburwbwgrbrggwgwwwwuwwbrwrbwr
+guuwuuuwrgwwgbruugwwwrwuggrrgwbwwruuuuubububrwrbgurbw
+rrwrrurggwurggguurrrrurwugwwrruwrruubwrbbguubww
+grrwgrrrwbubggrrwbbgggbgwbbwubrbwwugugggwbg
+wrgrrggwurbwbrguwrurwbwrbrbrggggrguwbwgwgwrbggbgrbgrb
+bwrbwbwurbrugggwbgbrguwrugugrruubrggbwuurrubub
+wbgwwubuurwwubbwwgurgugbbbgrgwuwbbwrbgwbwguugurubr
+bbbbruwuwgwbuuugrrbgugrwgrrwwggugrggugbbgrrbw
+wrggrwwubwruwbugubgurrwrbrrwbgrgbgrruguuubgbbwuwbub
+wgurrgubgrgbgggurgubbugbbbruruggrbggrgrwwrw
+rurbwwuuugurguwgwguwurrruubuguwwrbbburrbrwwugrruuw
+wwubwbggrurbwubbrwbuuruwbgugbwgwgrugubbwbub
+ruwbrbuguwuuuwwbrbwguuwgrwuruugbrgbbwugubrrrgrgb
+rwrbrwrbwuwbuubrugwrubwbuuwbubrwbrgurgwgbgrurwrruuwu
+rugwbruruguuuwgrbwruggggwbgruwrwuggubgruurbubwug
+wgruguuruwbrrbwubuwgbrwugrgubgrwgggbwwuggbwbb
+gubuwrgurwrbrbrugrruuwgbbwubwwbgbgguwuuwwgrbrwuwr
+grrrgwguwrgbrbbwbbrwbgugwbrgggggbbrrurbbgbggwbuugwugb
+gbrbggrbgrrbbggggubbbwuugubgggbgbrurburugwwwurwwuuw
+wrgguubrrwbrrugwuuruurwbuuwgwbuugubgbrbbrrbgrbgwrrrwrgguww
+uwwburbrrururbrwgrwrgrbuwubgugwwwgwgwrrurggu
+rgubgrwgruwwwgrrruwrububgrrwuubbwrguuwwrrubururguwgbrg
+gguwbrrrrgwbbgrrbubugrgwwbbgwrgrguwuwwrwbwwgubbgubbuwuwgw
+rwgrwrbuwbwrrwrrbrrbbbuubgrgbrgugbuuuwbuuw
+rgguwggrbrurwrrgbruwbguwwwrubwurbrbrwwbwwggrrrwbwg
+rwruubwuwguwrurrubwuubbburwubbwwguguurggbbwuwb
+wgwubbbrrbgbwrgubrgguurrrbuurwubbbguubguuuurguwwr
+grwwbgggrbbrbwgrwbuuuruwwgbbuguurgburbrgugurwb
+rgugwuuubgubwwwwbbuurwwwburrrgurbwbgbuwwruuugu
+gurrwwgrgwrbrbbgurbwrrbubrbuwbuurrrguugggrrbwugbb
+wgwburbwwbubrgurgbbugwrbbrwggwgbwbrbgwburbbugbrrbggbwwwwg
+uwubgbbubwrbbbubgbbgwbuguububruubbbwuwrububbg
+ubgbbuwgwrbrggrbrwrgubbubrbbuurrgwbrggbuuwwwrgwubwrbbwb
+wgrbrwwwgrbgruwbbwgbggwuugggwggbrwrwbburgubgburrwrrwrwbw
+wrgrbgrbugubrwwwwuubbrbrbrwgwuwbbrgwrbwwrbwbrrubbrr
+wrgbburuubwbrrggwurbwwbrwuwwugrwrbwwbwgrwwwrbrurubrgrbw
+rwwbwgwbgggwuuwwbrwgwgrubwwwrrbgruubwrgguwrwr
+rurbrwwruuuuugwgbbwgwrgrbbwbrwwruuuwwgrbgwbbbuurururwww
+uwguwbuggubwuubururgbgurrbbugbwuwrgwwrbwwuuwruwuubgb
+rwubrrrubgwubbgbubrrrrwbbbgbgrbbbuuwrwuggwgugr
+buwrgbggrburwwrrwrrgbrwbwurwgwubgwbwgrrgwbwrrbrbrgrbgububb
+wuuurwgbuwwwwuwbbugbrwurrgguwbbbbuuggwbrrwbgrbrgwrgrubug
+bbuwbrubrwbgurwbwbguugwwgwrwbgbwruurwuwbuuruuggr
+rbbrwwbbwuuwwuuurburrrgwgrwbbrrbuggwrwrgruugbu
+gbrgubuurgbgguwwwwubbgrbwrrurburugbwgbubbwruuuuruuwbbgwguw
+wurwggrggwwrwugbwgrwuuwrugbuuggbgrwrgwggrgugrgrwrrwbb
+rgwrwuwuwrgubuwbgurwrgurwuuuwgwwrgwgrgruwuwwggwurwrbbuw
+wrwwrgwbwgbugggrguuurwwuwrbrwrrruwwbrrrgrruubg
+wbwrrruuurgrrrwrbuwbggbguwugrbwbggbuburgruwgbbruubrwbrgrur
+uuubuguurruuwwurbuwbgwrrrbrbwrwbuwubugrrruwuggrrwb
+rrbggbubgrruubbgubuwubbgwuubgbrruwuugggbrbuubgugg
+buwugbwbbrugbwbgwurguwbwwbbgbbbuguwgrwburrgggbgbguruww
+wrgbgwurgrbrggrburguuubugbwgugrwbwwwwbbuubw
+gwruuubuubbbwurbgurrrbwwbburguugbwbrrgbubrwwrrwwgbbgbu
+wgubuugggrugrwrrggugguwgbwwwruuuwwurwbwgwbbwgr
+buwwwgrruuuwrwgggbbggbguuwwugwwguuuuuruubrruubbuwubggbgwrg
+gwrgbgubrwuruwuruguubbuwrbggwwrguugrrgwwbbwgwrbbwbgguuw
+wrgrbwuburwgwggggrrbrgrbbguuwuwbgrbwbubbbbb
+wuuurbguuwrurgggrwbgwrbgggrgrggrwuwguwrrugugrugwbuwbrug
+ugbubbugwbwgugbwuurwbuugbgwbgwgbrurgruuruubgugbwugwubu
+rgguwubwruubugbrrguruugrrwbrgggurrgbugwbrggu
+ggwrgrrrrwrggbbwwuwgbrrrugrrubwwwrgrruugurwgrbgwbg
+gugwrgwbugugrruubbbgugrwuurbruubwrrbbuuubbb
+gbuuggruguburwbrrbrggrguwguubugbwggbgwuwrwgrgub
+urbwrguguuwrugrbwgrrgbwrwrwwuuwgbgwbururggwurgrw
+wuwurrubrwubugbgwgwwuguugbgbuwrwbuwrgbggrurgruwuwuuu
+grrugwbrrbbwbrgguuwbubbgrugrwbwrurwggbwwwr
+rwbggurbrwubrbgwuwruwbrgwwgrubuuuurbbggbwrrrwur
+wwbugrgrgruwrgbugrwrgwgrbruuuuubbubrwbwrgrb
+wbbbrgwwrrrwwbrrwwwuwugwbrwgrbwuwuggbuwruuugubgbg
+wrgbuggbbrbrubgubbbuwrubbuwwgbggbbwgrwrruwgguwguwruubw
+guggwbwbgrrubbrwrrwgugguuuwrgbwgbbguwbbubw

day-19/main.c

@@ -0,0 +1,138 @@
+#include "aoc.h"
+
+typedef struct CacheEntry {
+    struct CacheEntry *next;
+    u64 hash;
+    str design;
+    i64 count;
+} CacheEntry;
+
+#define CACHE_SIZE (1 << 16)
+_Static_assert((CACHE_SIZE & (CACHE_SIZE - 1)) == 0, "Cache size must be a power of two");
+
+typedef struct {
+    Arena *arena;
+    CacheEntry *entries[CACHE_SIZE];
+} Cache;
+
+static void
+cache_init(Cache *cache, Arena *arena) {
+    cache->arena = arena;
+}
+
+static u64
+hash_str(str s) {
+    // fnv-1a hash
+    u64 hash = 14695981039346656037ULL;
+    for (i32 i = 0; i < s.len; i++) {
+        hash ^= s.data[i];
+        hash *= 1099511628211ULL;
+    }
+    return hash;
+}
+
+static f32
+cache_get_load_factor(Cache *cache) {
+    i32 count = 0;
+    for (i32 i = 0; i < CACHE_SIZE; i++) {
+        count += (cache->entries[i] != NULL);
+    }
+    return (f32) count / CACHE_SIZE;
+}
+
+static CacheEntry *
+cache_get(Cache *cache, str design) {
+    u64 hash = hash_str(design);
+    u64 index = hash & (CACHE_SIZE - 1);
+    for (CacheEntry *e = cache->entries[index]; e; e = e->next) {
+        if (e->hash == hash && str_eq(e->design, design)) {
+            return e;
+        }
+    }
+    return NULL;
+}
+
+static void
+cache_put(Cache *cache, str design, i64 count) {
+    u64 hash = hash_str(design);
+    u64 index = hash & (CACHE_SIZE - 1);
+    for (CacheEntry *e = cache->entries[index]; e; e = e->next) {
+        if (e->hash == hash && str_eq(e->design, design)) {
+            e->count = count;
+        }
+    }
+    CacheEntry *entry = ARENA_ALLOC(cache->arena, CacheEntry);
+    entry->hash = hash;
+    entry->design = design;
+    entry->count = count;
+    entry->next = cache->entries[index];
+    cache->entries[index] = entry;
+}
+
+static i64 cache_hit_count = 0;
+static i64 cache_miss_count = 0;
+
+static i64
+count_realizations(Cache *cache, str design, str *patterns, i32 len) {
+    if (design.len == 0) {
+        return 1;
+    }
+    else {
+        CacheEntry *entry;
+        i64 total = 0;
+        if ((entry = cache_get(cache, design))) {
+            cache_hit_count++;
+            total = entry->count;
+        }
+        else {
+            cache_miss_count++;
+            for (i32 i = 0; i < len; i++) {
+                if (str_starts_with(design, patterns[i])) {
+                    str remainder = str_sub(design, patterns[i].len, design.len);
+                    total += count_realizations(cache, remainder, patterns, len);
+                }
+            }
+            cache_put(cache, design, total);
+        }
+        return total;
+    }
+}
+
+int main(int argc, char **argv) {
+    Arena *arena = make_arena(Megabytes(2));
+    Tokens lines = read_lines(arena, argv[1]);
+
+    str avail_line = lines.tokens[0];
+    DYNAMIC_ARRAY(str) patterns = {0};
+    str pattern = {0};
+    while ((pattern = str_next_token(&avail_line, STR(","))).len > 0) {
+        *push(&patterns, arena) = str_trim(pattern);
+    }
+
+    Tokens desired = {
+        .tokens = lines.tokens + 2,
+        .len = lines.len - 2,
+    };
+
+    Cache *cache = ARENA_ALLOC(arena, Cache);
+    cache_init(cache, arena);
+
+    i64 part_1 = 0;
+    i64 part_2 = 0;
+    for (i32 i = 0; i < desired.len; i++) {
+        str towel = str_trim(desired.tokens[i]);
+        i64 count = count_realizations(cache, towel, patterns.data, patterns.len);
+        part_1 += (i64) (count > 0);
+        part_2 += count;
+        /* printf(STR_FMT " -> %s (%ld)\n", STR_ARG(towel), (count > 0) ? "possible" : "impossible", count); */
+    }
+    printf("%ld\n", part_1);
+    printf("%ld\n", part_2);
+
+    if (false) {
+        printf("Hit count: %ld\n", cache_hit_count);
+        printf("Miss count: %ld\n", cache_miss_count);
+        printf("Hit Rate: %.2f%%\n", (f64) cache_hit_count / (cache_hit_count + cache_miss_count) * 100);
+        printf("Load factor: %.2f%%\n", cache_get_load_factor(cache) * 100);
+    }
+}

day-19/test.txt

@@ -0,0 +1,10 @@
+r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb