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authorJack Sangdahl <[email protected]>2024-12-20 00:58:55 -0700
committerJack Sangdahl <[email protected]>2024-12-20 00:58:55 -0700
commitb4583a13ed0b099ceb4d8ca6125ca4d4dcdfe978 (patch)
tree926434069ad82b5f658628713218a0a6d0ad8e69
parente785d6e4143fe9a622815dbc177c4e75e3e7cc40 (diff)
downloadaoc-b4583a13ed0b099ceb4d8ca6125ca4d4dcdfe978.tar.gz
aoc-b4583a13ed0b099ceb4d8ca6125ca4d4dcdfe978.zip
Day 20 2024
-rw-r--r--20_2024.py69
-rw-r--r--data/20_2024.txt141
2 files changed, 210 insertions, 0 deletions
diff --git a/20_2024.py b/20_2024.py
new file mode 100644
index 0000000..b59d20a
--- /dev/null
+++ b/20_2024.py
@@ -0,0 +1,69 @@
+from collections import deque
+
+input = "data/20_2024.txt"
+data = open(input).read().strip()
+lines = data.split("\n")
+rows, cols = len(lines), len(lines[0])
+lines = [[lines[r][c] for c in range(cols)] for r in range(rows)]
+dirs = [(-1, 0), (0, 1), (1, 0), (0, -1)]
+
+for r in range(rows):
+ for c in range(cols):
+ if lines[r][c] == "S":
+ sr, sc = r, c
+ if lines[r][c] == "E":
+ er, ec = r, c
+
+dist, q = {}, deque([(0, er, ec)])
+while q:
+ d, r, c = q.popleft()
+ if (r, c) in dist:
+ continue
+ dist[(r, c)] = d
+ for dr, dc in dirs:
+ rr, cc = r + dr, c + dc
+ if 0 <= rr < rows and 0 <= cc < cols and lines[rr][cc] != "#":
+ q.append((d + 1, rr, cc))
+
+
+def find_cheat(d0, cheat_time):
+ q = deque([(0, None, None, None, sr, sc)])
+ res, vis, keep = set(), set(), 100
+ while q:
+ d, cheat_start, cheat_end, cheat_time, r, c = q.popleft()
+ assert cheat_end is None
+ if d >= d0 - keep:
+ continue
+ if lines[r][c] == "E":
+ if cheat_end is None:
+ cheat_end = (r, c)
+ if d <= d0 - keep and (cheat_start, cheat_end) not in res:
+ res.add((cheat_start, cheat_end))
+ if (r, c, cheat_start, cheat_end, cheat_time) in vis:
+ continue
+ vis.add((r, c, cheat_start, cheat_end, cheat_time))
+ if cheat_start is None:
+ assert lines[r][c] != "#"
+ q.append((d, (r, c), None, cheat_time, r, c))
+ if cheat_time is not None and lines[r][c] != "#":
+ assert lines[r][c] in [".", "S", "E"]
+ if dist[(r, c)] <= d0 - 100 - d:
+ res.add((cheat_start, (r, c)))
+ if cheat_time == 0:
+ continue
+ else:
+ for dr, dc in dirs:
+ rr, cc = r + dr, c + dc
+ if cheat_time is not None:
+ assert cheat_time > 0
+ if 0 <= rr < rows and 0 <= cc < cols:
+ q.append((d + 1, cheat_start, None, cheat_time - 1, rr, cc))
+ else:
+ if 0 <= rr < rows and 0 <= cc < cols and lines[rr][cc] != "#":
+ q.append((d + 1, cheat_start, cheat_end, cheat_time, rr, cc))
+ return len(res)
+
+
+d0 = dist[(sr, sc)]
+print(find_cheat(d0, 2))
+print(find_cheat(d0, 20))
diff --git a/data/20_2024.txt b/data/20_2024.txt
new file mode 100644
index 0000000..0b80b36
--- /dev/null
+++ b/data/20_2024.txt
@@ -0,0 +1,141 @@
+#############################################################################################################################################
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