2024 day19 (incomplete)

2024/day19/input.txt

@@ -0,0 +1,402 @@
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2024/day19/input.txt.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_2024_day19_input_txt_start __asm("_binary_2024_day19_input_txt_start");
+extern uint32_t _binary_2024_day19_input_txt_end __asm("_binary_2024_day19_input_txt_end");
+extern uint32_t _binary_2024_day19_input_txt_size __asm("_binary_2024_day19_input_txt_size");
+
+#ifdef __cplusplus
+}
+#endif

2024/day19/radix.py

@@ -0,0 +1,59 @@
+from pprint import pprint
+
+with open('input.txt', 'r') as f:
+    s = f.read()
+
+patterns = s.strip().split('\n\n')[0].split(", ")
+
+def radix_add(d, s):
+    c = s[0]
+    tail = s[1:]
+
+    if c not in d:
+        d[c] = {}
+
+    if not tail:
+        pass
+        #d[c].append(None)
+    else:
+        radix_add(d[c], tail)
+
+tree = dict()
+
+#print("max", max(map(len, patterns)))
+
+for pattern in patterns:
+    radix_add(tree, pattern)
+
+def print_tree(d, indent, s):
+    indent2 = indent + "  "
+    indent3 = indent2 + "  "
+
+    if d is None:
+        return
+
+    print(indent + "switch (s[ix++]) {")
+    for key, value in d.items():
+        print(indent + f"case '{key}':")
+        if s + key in patterns:
+            print(indent2 + "matches |= (1 << (ix - 1));")
+        print(indent2 + "if (ix >= length) {")
+        print(indent3 + "return matches;")
+        print(indent2 + "}")
+        print_tree(value, indent2, s + key)
+        print(indent2 + "break;")
+
+    print(indent + "default:")
+    print(indent2 + "break;")
+    print(indent + "}")
+
+#print(patterns)
+print("static uint32_t count_substring_matches(const char * s, int length)")
+print("{")
+print("  int ix = 0;")
+print("  uint32_t matches = 0;")
+print("  if (ix >= length)")
+print("    return matches;")
+print_tree(tree, "  ", "")
+print("  return matches;")
+print("}")

2024/day19/sample1.txt

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

2024/day19/sample1.txt.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_2024_day19_sample1_txt_start __asm("_binary_2024_day19_sample1_txt_start");
+extern uint32_t _binary_2024_day19_sample1_txt_end __asm("_binary_2024_day19_sample1_txt_end");
+extern uint32_t _binary_2024_day19_sample1_txt_size __asm("_binary_2024_day19_sample1_txt_size");
+
+#ifdef __cplusplus
+}
+#endif

2024/day19/solution.c

@@ -0,0 +1,67 @@
+#include <stdint.h>
+
+#include "parse.h"
+#include "printf.h"
+
+#include "radix.c"
+
+const char * find_first_towel(const char * input)
+{
+  input = parse_find(input, '\n');
+  input = parse_skip(input, '\n');
+  return input;
+}
+
+static int towel_valid(const char * start, const char * end)
+{
+  if (end == start)
+    return 1;
+
+  int length = end - start;
+  uint32_t matches = count_substring_matches(start, length);
+  int ix = 1;
+
+  int sum = 0;
+
+  while (matches != 0) {
+    if (matches & 1) {
+      sum += towel_valid(&start[ix], end);
+    }
+    matches >>= 1;
+    ix += 1;
+  }
+
+  return sum;
+}
+
+int64_t _2024_day19_part1(const char * input, int length)
+{
+  const char * end = input + length;
+  const char * towel = find_first_towel(input);
+
+  int valid = 0;
+  while (towel < end) {
+    const char * towel_end = parse_find(towel, '\n');
+    valid += (int)(towel_valid(towel, towel_end) > 0);
+
+    towel = parse_skip(towel_end + 1, '\n');
+  }
+
+  return valid;
+}
+
+int64_t _2024_day19_part2(const char * input, int length)
+{
+  const char * end = input + length;
+  const char * towel = find_first_towel(input);
+
+  int sum = 0;
+  while (towel < end) {
+    const char * towel_end = parse_find(towel, '\n');
+    sum += towel_valid(towel, towel_end) > 0;
+
+    towel = parse_skip(towel_end + 1, '\n');
+  }
+
+  return sum;
+}

input_dreamcast.inc

@@ -48,6 +48,8 @@
 #include "2024/day17/input.txt.h"
 #include "2024/day18/sample1.txt.h"
 #include "2024/day18/input.txt.h"
+#include "2024/day19/sample1.txt.h"
+#include "2024/day19/input.txt.h"
 
 static struct start_size sample[][2] = {
   {
@@ -188,6 +190,12 @@ static struct start_size sample[][2] = {
     { (  char *)&_binary_2024_day18_sample1_txt_start,
       (uint32_t)&_binary_2024_day18_sample1_txt_size   },
   },
+  {
+    { (  char *)&_binary_2024_day19_sample1_txt_start,
+      (uint32_t)&_binary_2024_day19_sample1_txt_size   },
+    { (  char *)&_binary_2024_day19_sample1_txt_start,
+      (uint32_t)&_binary_2024_day19_sample1_txt_size   },
+  },
 };
 
 static struct start_size input[] = {
@@ -237,4 +245,6 @@ static struct start_size input[] = {
     (uint32_t)&_binary_2024_day17_input_txt_size   },
   { (  char *)&_binary_2024_day18_input_txt_start,
     (uint32_t)&_binary_2024_day18_input_txt_size   },
+  { (  char *)&_binary_2024_day19_input_txt_start,
+    (uint32_t)&_binary_2024_day19_input_txt_size   },
 };

runner.c

@@ -38,7 +38,7 @@ bool runner_tick(struct runner_state * runner_state)
   int year = solution[ix].year;
   int day = solution[ix].day;
 
-  if (year != 2024 || day != 18) {
+  if (year != 2024 || day != 19) {
     return false;
   }
 

runner.inc

@@ -50,6 +50,8 @@ int64_t _2024_day17_part1(const char * input, int length);
 int64_t _2024_day17_part2(const char * input, int length);
 int64_t _2024_day18_part1(const char * input, int length);
 int64_t _2024_day18_part2(const char * input, int length);
+int64_t _2024_day19_part1(const char * input, int length);
+int64_t _2024_day19_part2(const char * input, int length);
 
 struct day_funcs solution[] = {
   {
@@ -167,4 +169,9 @@ struct day_funcs solution[] = {
     {_2024_day18_part1, _2024_day18_part2},
     NULL,
   },
+  {
+    2024, 19,
+    {_2024_day19_part1, _2024_day19_part2},
+    NULL,
+  },
 };

solutions.mk

@@ -73,4 +73,7 @@ DAY_OBJ = \
 	2024/day17/solution.o \
 	2024/day18/sample1.txt.o \
 	2024/day18/input.txt.o \
-	2024/day18/solution.o
+	2024/day18/solution.o \
+	2024/day19/sample1.txt.o \
+	2024/day19/input.txt.o \
+	2024/day19/solution.o