Day 4

2024/day04/challenge

@@ -0,0 +1,75 @@
+--- Day 4: Ceres Search ---
+
+"Looks like the Chief's not here. Next!" One of The Historians pulls out a device and pushes the only button on it. After a brief flash, you recognize the interior of the Ceres monitoring station!
+
+As the search for the Chief continues, a small Elf who lives on the station tugs on your shirt; she'd like to know if you could help her with her word search (your puzzle input). She only has to find one word: XMAS.
+
+This word search allows words to be horizontal, vertical, diagonal, written backwards, or even overlapping other words. It's a little unusual, though, as you don't merely need to find one instance of XMAS - you need to find all of them. Here are a few ways XMAS might appear, where irrelevant characters have been replaced with .:
+
+..X...
+.SAMX.
+.A..A.
+XMAS.S
+.X....
+
+The actual word search will be full of letters instead. For example:
+
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX
+
+In this word search, XMAS occurs a total of 18 times; here's the same word search again, but where letters not involved in any XMAS have been replaced with .:
+
+....XXMAS.
+.SAMXMS...
+...S..A...
+..A.A.MS.X
+XMASAMX.MM
+X.....XA.A
+S.S.S.S.SS
+.A.A.A.A.A
+..M.M.M.MM
+.X.X.XMASX
+
+Take a look at the little Elf's word search. How many times does XMAS appear?
+
+Your puzzle answer was 2493.
+--- Part Two ---
+
+The Elf looks quizzically at you. Did you misunderstand the assignment?
+
+Looking for the instructions, you flip over the word search to find that this isn't actually an XMAS puzzle; it's an X-MAS puzzle in which you're supposed to find two MAS in the shape of an X. One way to achieve that is like this:
+
+M.S
+.A.
+M.S
+
+Irrelevant characters have again been replaced with . in the above diagram. Within the X, each MAS can be written forwards or backwards.
+
+Here's the same example from before, but this time all of the X-MASes have been kept instead:
+
+.M.S......
+..A..MSMS.
+.M.S.MAA..
+..A.ASMSM.
+.M.S.M....
+..........
+S.S.S.S.S.
+.A.A.A.A..
+M.M.M.M.M.
+..........
+
+In this example, an X-MAS appears 9 times.
+
+Flip the word search from the instructions back over to the word search side and try again. How many times does an X-MAS appear?
+
+Your puzzle answer was 1890.
+
+Both parts of this puzzle are complete! They provide two gold stars: **

2024/day04/code.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+
+import sys, re
+import numpy as np
+from scipy.ndimage import rotate
+from collections import defaultdict
+
+
+# copied from stackoverflow
+def groups(data, func):
+    grouping = defaultdict(list)
+    for y in range(len(data)):
+        for x in range(len(data[y])):
+            grouping[func(x, y)].append(data[y][x])
+    return list(map(grouping.get, sorted(grouping)))
+
+
+def a_cross(puzzle, x, y):
+    if puzzle[y][x] != 'A': return False
+    elif x == 0 or y == 0 or x == len(puzzle[y])-1 or y == len(puzzle)-1: return False
+    elif ((puzzle[y-1][x-1] == 'M' and puzzle[y+1][x+1] == 'S') or (puzzle[y-1][x-1] == 'S' and puzzle[y+1][x+1] == 'M')) and ((puzzle[y+1][x-1] == 'M' and puzzle[y-1][x+1] == 'S') or (puzzle[y+1][x-1] == 'S' and puzzle[y-1][x+1] == 'M')): 
+        return True
+    else: return False
+
+
+if __name__ == '__main__':
+    puzzle = [line.strip('\n') for line in open(sys.argv[1])]
+    words = re.compile(r'(?=XMAS|SAMX)')
+    res1 = len(words.findall('D'.join(puzzle)))
+    npuzzle = np.array([list(p) for p in puzzle])
+    # rows = groups(puzzle, lambda x, y: y)
+    #cols 
+    res1 += len(words.findall('.'.join(['.'.join([''.join(l) for l in groups(npuzzle, lambda x, y: x)])])))
+    #fdiag
+    res1 += len(words.findall('.'.join(['.'.join([''.join(l) for l in groups(npuzzle, lambda x, y: x + y)])])))
+    #bdiag
+    res1 += len(words.findall('.'.join(['.'.join([''.join(l) for l in groups(npuzzle, lambda x, y: x - y)])])))
+
+    res2 = 0
+    npuzzle = np.array([list(p) for p in puzzle])
+    for y in range(len(npuzzle)):
+        for x in range(len(npuzzle[y])):
+            res2 += int(a_cross(npuzzle, x, y))
+
+    # challenge 1
+    print(f"challenge 1:\n{res1}\n")
+
+    # challenge 2
+    print(f"challenge 2:\n{res2}")
+

2024/day04/example

@@ -0,0 +1,10 @@
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX

2024/day04/input

@@ -0,0 +1,140 @@
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