day4 part2, and some cleanup

2024/python/day02.py

@@ -3,12 +3,15 @@ import shared
 import itertools
 import functools
 
+
 def is_increasing(sequence):
     return all(sequence[i] < sequence[i + 1] for i in range(len(sequence) - 1))
 
+
 def is_decreasing(sequence):
     return all(sequence[i] > sequence[i + 1] for i in range(len(sequence) - 1))
 
+
 def parse_line(row):
     for previous, current in zip(row, row[1:]):
         diff = abs(current - previous)
@@ -41,7 +44,6 @@ def brute_force(row):
     return 0
 
 
-
 # @shared.profile
 def part2(rows):
     rows = [list(map(int, row.split())) for row in rows]

2024/python/day03.py

@@ -2,10 +2,11 @@ import shared
 import re
 from scanf import scanf
 
+
 # @shared.profile
 def part1(rows):
     total = 0
-    r = re.compile(r'mul\(\d+,\d+\)')
+    r = re.compile(r"mul\(\d+,\d+\)")
     for row in rows:
         muls = r.findall(row)
         for m in muls:
@@ -14,11 +15,10 @@ def part1(rows):
     print(total)
 
 
-
 # @shared.profile
 def part2(rows):
     total = 0
-    r = re.compile(r'(mul\(\d+,\d+\)|do\(\)|don\'t\(\))')
+    r = re.compile(r"(mul\(\d+,\d+\)|do\(\)|don\'t\(\))")
     enabled = True
     for row in rows:
         muls = r.findall(row)

2024/python/day04.py

@@ -19,9 +19,34 @@ def part1(mx):
 
 
 # @shared.profile
-def part2(rows):
-    pass
+def part2(mx):
+    count = 0
+    for idr, row in enumerate(mx):
+        for idc, c in enumerate(row):
+            if c != "A":
+                continue
 
+            nb = matrix.get_neighbors_cardinal(mx, idc, idr, diagonals=True)
+
+            eastdown= []
+            for d in ("NW","SE"):
+                eastdown.append(nb.get(d, {}).get("value"))
+            if None in eastdown:
+                continue
+            eastdown = sorted(eastdown)
+
+            westdown = []
+            for d in ("NE", "SW"):
+                westdown.append(nb.get(d, {}).get("value"))
+            if None in westdown:
+                continue
+            westdown = sorted(westdown)
+
+            if eastdown == ['M','S'] and westdown == ['M', 'S']:
+                count += 1
+
+
+    print(count)
 
 def main():
     mx = matrix.load_matrix_file(shared.get_fname(4), str)
@@ -29,9 +54,9 @@ def main():
         part1(mx)
         print("🕒", elapsed())
 
-    rows = [row for row in shared.load_rows(4, True)]
+    mx = matrix.load_matrix_file(shared.get_fname(4), str)
     with shared.elapsed_timer() as elapsed:
-        part2(rows)
+        part2(mx)
         print("🕒", elapsed())
 
 

2024/python/shared.py

@@ -6,6 +6,7 @@ import functools
 import pstats
 from itertools import groupby
 
+
 def all_equal(iterable):
     g = groupby(iterable)
     return next(g, True) and not next(g, False)
@@ -27,9 +28,11 @@ def profile(func):
 
     return inner
 
+
 def spl(y):
     return [int(w) for w in y]
 
+
 def minmax(l):
     return min(l), max(l)