From 4164b85ac490f97351ed5774903318db2dbeb398 Mon Sep 17 00:00:00 2001
From: Daniel Weber <djweber12@gmail.com>
Date: Sat, 21 Dec 2024 23:50:32 -0500
Subject: [PATCH] Adding day 21. Winter Solstice

---
 2024/day21/main.py | 143 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 2024/day21/main.py

diff --git a/2024/day21/main.py b/2024/day21/main.py
new file mode 100644
index 0000000..76de305
--- /dev/null
+++ b/2024/day21/main.py
@@ -0,0 +1,143 @@
+import sys
+import re
+import copy
+import os
+sys.path.insert(1, os.path.abspath('../../'))
+from python_tools.aoc_utils import *
+
+# +---+---+---+
+# | 7 | 8 | 9 |
+# +---+---+---+
+# | 4 | 5 | 6 |
+# +---+---+---+
+# | 1 | 2 | 3 |
+# +---+---+---+
+#     | 0 | A |
+#     +---+---+
+#     +---+---+
+#     | ^ | A |
+# +---+---+---+
+# | < | v | > |
+# +---+---+---+
+
+
+lg = {
+        "7": [0,0],
+        "8": [0,1],
+        "9": [0,2],
+        "4": [1,0],
+        "5": [1,1],
+        "6": [1,2],
+        "1": [2,0],
+        "2": [2,1],
+        "3": [2,2],
+        "dead": [3,0],
+        "0": [3,1],
+        "A": [3,2],
+      }
+sg = {
+        "dead": [0,0],
+        "^": [0,1],
+        "A": [0,2],
+        "<": [1,0],
+        "V": [1,1],
+        ">": [1,2],
+      }
+
+G = {}
+
+def move_line(line, s, idx):
+    global sg
+    global lg
+    global G
+    if idx not in G:
+        G[idx] = {}
+    if len(s) == 0:
+        return len(line)
+    else:
+        if line not in G[idx]:
+            sum = 0
+            g = lg
+            if idx != 0:
+                g = sg
+            current_pos = s[0]
+            for c in line:
+                product = 1
+                if type(c) == list:
+                    product = c[0]
+                    c = c[1]
+                # if G[
+                results = []
+                i = g[c].copy()
+                for k in [[0,1],[1,0]]:
+                    l = [["^","V"],["<",">"]]
+                    if (
+                    i[k[0]] != g["dead"][k[0]] or
+                    current_pos[k[1]] != g["dead"][k[1]]
+                       ):
+                        results.append(0)
+                        todo = ''
+                        for j in k:
+                            diff = i[j] - current_pos[j]
+                            if diff < 0:
+                            # if c not in G[idx]:
+                                todo+=abs(diff)*l[j][0]
+                                # results[-1] += abs(diff)*move_line(l[j][0], s[1:], idx+1)
+                            elif diff > 0:
+                                # results[-1] += abs(diff)*move_line(l[j][1], s[1:], idx+1)
+                                todo+=abs(diff)*l[j][1]
+                        # results[-1] += move_line("A", s[1:], idx+1)
+                        todo += "A"
+                        results[-1]+=move_line(todo, s[1:], idx+1)
+
+                sum+=min(results)-1+product
+                current_pos = i
+            G[idx][line] = sum
+        return G[idx][line]
+
+
+def part_one(input):
+    global G
+    G = {}
+    sum = 0
+    for i in input:
+        rs = [
+                lg["A"],
+                sg["A"],
+                sg["A"],
+                ]
+        sum += int(re.findall(r"\d+", i)[0]) * move_line(i, rs, 0)
+    print("Part1: ", sum)
+
+
+
+
+def part_two(input):
+    global G
+    G = {}
+    sum = 0
+    for i in input:
+        rs = [
+                lg["A"],
+                sg["A"], sg["A"], sg["A"], sg["A"], sg["A"],
+                sg["A"], sg["A"], sg["A"], sg["A"], sg["A"],
+                sg["A"], sg["A"], sg["A"], sg["A"], sg["A"],
+                sg["A"], sg["A"], sg["A"], sg["A"], sg["A"],
+                sg["A"], sg["A"], sg["A"], sg["A"], sg["A"],
+                ]
+        sum += int(re.findall(r"\d+", i)[0]) * move_line(i, rs, 0)
+    print("Part2: ", sum)
+
+def main():
+    contents = file2list("input.txt")
+    part_one(contents)
+    part_two(contents)
+
+if __name__ == "__main__":
+    main()
+
+# 029A: <vA<AA>>^AvAA<^A>A<v<A>>^AvA^A<vA>^A<v<A>^A>AAvA^A<v<A>A>^AAAvA<^A>A
+# 980A: <v<A>>^AAAvA^A<vA<AA>>^AvAA<^A>A<v<A>A>^AAAvA<^A>A<vA>^A<A>A
+# 179A: <v<A>>^A<vA<A>>^AAvAA<^A>A<v<A>>^AAvA^A<vA>^AA<A>A<v<A>A>^AAAvA<^A>A
+# 456A: <v<A>>^AA<vA<A>>^AAvAA<^A>A<vA>^A<A>A<vA>^A<A>A<v<A>A>^AAvA<^A>A
+# 379A: <v<A>>^AvA^A<vA<AA>>^AAvA<^A>AAvA^A<vA>^AA<A>A<v<A>A>^AAAvA<^A>A