day4 part1

2024/full/day04.txt

@@ -0,0 +1,140 @@
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2024/python/day04.py

@@ -0,0 +1,39 @@
+import matrix
+import shared
+from collections import Counter
+
+# XMAS = ['X','M','A','S']
+XMAS = "XMAS"
+
+
+# @shared.profile
+def part1(mx):
+    count = 0
+    for idr, row in enumerate(mx):
+        for idc, c in enumerate(row):
+            los = matrix.line_of_sight(mx, idr, idc, distance=4, diagonals=True)
+            words = list(map("".join, los.values()))
+            counter = Counter(words)
+            count += counter[XMAS]
+    print(count)
+
+
+# @shared.profile
+def part2(rows):
+    pass
+
+
+def main():
+    mx = matrix.load_matrix_file(shared.get_fname(4), str)
+    with shared.elapsed_timer() as elapsed:
+        part1(mx)
+        print("🕒", elapsed())
+
+    rows = [row for row in shared.load_rows(4, True)]
+    with shared.elapsed_timer() as elapsed:
+        part2(rows)
+        print("🕒", elapsed())
+
+
+if __name__ == "__main__":
+    main()

2024/python/matrix.py

@@ -186,6 +186,7 @@ def get_neighbor_coords(matrix, c, r, diagonals=True):
             pass  # okay we out of bounds boizzzz
     return neighbors
 
+
 def get_neighbors_cardinal(matrix, c, r, diagonals=True):
     height = len(matrix)
     width = len(matrix[0])
@@ -199,14 +200,17 @@ def get_neighbors_cardinal(matrix, c, r, diagonals=True):
         try:
             value = matrix[r + _r][c + _c]  # Try to get a value error
             if r + _r >= 0 and c + _c >= 0:
-                neighbors[CARDINALS[coord]] = {"c": c + _c, "r": r + _r, "value":value}  # woo, no error, this coord is valid
+                neighbors[CARDINALS[coord]] = {
+                    "c": c + _c,
+                    "r": r + _r,
+                    "value": value,
+                }  # woo, no error, this coord is valid
         except IndexError:
             pass  # okay we out of bounds boizzzz
     return neighbors
 
 
-
+def line_of_sight_coords_diagonals(
-def line_of_sight_coords(
     matrix, row, col, distance=None
 ) -> Dict[str, List[Tuple[int, int]]]:
     """
@@ -221,37 +225,112 @@ def line_of_sight_coords(
     col_ids = list(range(0, height))
     row_ids = list(range(0, width))
 
+    directions = {
+        "UR": [],
+        "UL": [],
+        "DR": [],
+        "DL": []
+    }
+    ur = False
+    ul = False
+    dl = False
+    dr = False
+    
+    # Boundaries of the grid
+    max_row, max_col = height, width
+    
+    # Up-right (decrease row, increase column)
+    r, c = row, col
+    while r > 0 and c < max_col - 1:
+        ur = True
+        r -= 1
+        c += 1
+        directions["UR"].append((r, c))
+    
+    # Up-left (decrease row, decrease column)
+    r, c = row, col
+    while r > 0 and c > 0:
+        ul = True
+        r -= 1
+        c -= 1
+        directions["UL"].append((r, c))
+    
+    # Down-right (increase row, increase column)
+    r, c = row, col
+    while r < max_row - 1 and c < max_col - 1:
+        dr = True
+        r += 1
+        c += 1
+        directions["DR"].append((r, c))
+    
+    # Down-left (increase row, decrease column)
+    r, c = row, col
+    while r < max_row - 1 and c > 0:
+        dl = True
+        r += 1
+        c -= 1
+        directions["DL"].append((r, c))
+
     if distance:
-        up_ids, down_ids = (
+        for _dir in ["DL", "UL", "DR", "UR"]:
-            list(reversed(col_ids[:col])),
+            directions[_dir] =  directions[_dir][:distance - 1]
-            col_ids[col + 1 : col + distance + 1],
+            if directions[_dir]:
-        )
+                directions[_dir].insert(0, (row,col))
-        left_ids, right_ids = (
+    return directions
-            list(reversed(row_ids[:row])),
+
-            row_ids[row + 1 : row + distance + 1],
+
-        )
+def line_of_sight_coords(
+    matrix, row, col, distance=None, diagonals=False
+) -> Dict[str, List[Tuple[int, int]]]:
+    """
+    Takes a matrix, a row, and a column
+    calculates the coordinates to the edge for all four cardinal directions
+
+    returns a dict with a list  of tuple coordes TRAVELING AWAY from the
+    requested coordinate
+    """
+    height, width = get_size(matrix)
+
+    col_ids = list(range(0, height))
+    row_ids = list(range(0, width))
+
+    up_ids = list(reversed(col_ids[:col]))
+    down_ids = col_ids[col + 1 :]
+    left_ids = list(reversed(row_ids[:row]))
+    right_ids = row_ids[row + 1 :]
+
+    if distance:
+        left = [(r, col) for r in left_ids[:distance - 1]]
+        right = [(r, col) for r in right_ids[:distance - 1]]
+        up = [(row, c) for c in up_ids[:distance - 1]]
+        down = [(row, c) for c in down_ids[:distance - 1]]
+        left.insert(0, (row, col))
+        right.insert(0, (row, col))
+        down.insert(0, (row, col))
+        up.insert(0, (row, col))
     else:
-        up_ids, down_ids = list(reversed(col_ids[:col])), col_ids[col + 1 :]
+        left = [(r, col) for r in left_ids]
-        left_ids, right_ids = list(reversed(row_ids[:row])), row_ids[row + 1 :]
+        right = [(r, col) for r in right_ids]
+        up = [(row, c) for c in up_ids]
+        down = [(row, c) for c in down_ids]
 
-    left = [(r, col) for r in left_ids]
+    directions = {
-    right = [(r, col) for r in right_ids]
-    up = [(row, c) for c in up_ids]
-    down = [(row, c) for c in down_ids]
-
-    return {
         "U": up,
         "L": left,
         "D": down,
         "R": right,
     }
+    if diagonals:
+        vals = line_of_sight_coords_diagonals(matrix, row, col, distance)
+        directions.update(vals)
+    return directions
 
 
-def line_of_sight(mx, row, col, distance=None):
+def line_of_sight(mx, row, col, distance=None, diagonals=False):
     """
     renders a line of sight coord calculation, into the values
     """
-    coords = line_of_sight_coords(mx, row, col, distance)
+    coords = line_of_sight_coords(mx, row, col, distance, diagonals)
     los = defaultdict(list)
     for k, ids in coords.items():
         for _row, _col in ids:

2024/samples/day04.txt

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