day 11

python/README.md

@@ -5,4 +5,6 @@ ToDo
 
 - Day 5 Part 2
 
-- Day 7 Part 2
+- Day 7 Part 2
+
+- Day 10 both parts

python/day11.py

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+lines = open("inputs/day11.txt").readlines()
+
+def mkmat(lines):
+    mat = [[0 if x == "." else 1 for x in line.strip("\n")] for line in lines]
+    return mat
+
+def empty_spaces(mat):
+    empty_lines = []
+    for idx, line in enumerate(mat):
+        if sum(line) == 0:
+            empty_lines.append(idx)
+    empty_cols = []
+    for i in range(len(mat[0])):
+        col = [x[i] for x in mat]
+        if sum(col) == 0:
+            empty_cols.append(i)
+    return empty_lines, empty_cols
+
+def expand_mat(mat):
+    empty_lines = []
+    for idx, line in enumerate(mat):
+        if sum(line) == 0:
+            empty_lines.append(idx)
+    while empty_lines:
+        idx = empty_lines.pop(0)
+        mat.insert(idx, [0 for x in range(len(mat[0]))])
+        if empty_lines:
+            empty_lines = [x+1 for x in empty_lines]
+    empty_cols = []
+    for i in range(len(mat[0])):
+        col = [x[i] for x in mat]
+        if sum(col) == 0:
+            empty_cols.append(i)
+    while empty_cols:
+        idx = empty_cols.pop(0)
+        for line in mat:
+            line.insert(idx, 0)
+        if empty_cols:
+            empty_cols = [x+1 for x in empty_cols]
+    return mat
+
+def galaxies(mat):
+    coords = []
+    for idx, line in enumerate(mat):
+        for jdx, p in enumerate(line):
+            if p == 1:
+                coords.append((idx, jdx))
+    return coords
+
+def bfsdistances(coords, mat):
+    dists = [[0 for x in range(len(coords))] for y in range(len(coords))]
+    for idx, coord in enumerate(coords):
+        paths = bfs(coord, mat)
+        for jdx, path in enumerate(paths):
+            dists[idx][jdx] = len(path)
+    return dists
+
+def manhattendistances(coords, expansions, expansionrate=1000000-1):
+    (rows, cols) = expansion
+    dists = [[0 for x in range(len(coords))] for y in range(len(coords))]
+    for i, coord1 in enumerate(coords):
+        for j, coord2 in enumerate(coords):
+            emptyrows = len([x for x in range(coord1[0], coord2[0]+1) if x in rows]) + len([x for x in range(coord1[0], coord2[0]+1)[::-1] if x in rows])
+            emptycols = len([x for x in range(coord1[1], coord2[1]+1) if x in cols]) + len([x for x in range(coord1[1], coord2[1]+1)[::-1] if x in cols])
+            d = manhatten(coord1, coord2) + ((emptyrows+emptycols) * expansionrate)
+            dists[i][j] = d
+    return dists
+
+def manhatten(x,d):
+    (x,y) = x
+    (dx, dy) = d
+    return abs(x-dx) + abs(y-dy)
+
+def bfs(start, maze):
+    paths = []
+    directions = [(-1, 0), (1, 0), (0, -1), (0, 1)]
+    stack = [(start, [])]
+    visited = [[0 for x in range(len(mat[0]))] for y in range(len(mat))]
+    visited[start[0]][start[1]] = 1
+    while stack:
+        (x,y), path = stack.pop(0)
+        for dx, dy in directions:
+            newx, newy = x+dx, y+dy
+            if 0 <= newx < len(mat) and 0 <= newy < len(mat[0]) and visited[newx][newy] == 0:
+                new_path = path + [(newx, newy)]
+                if mat[newx][newy] == 1:
+                    paths.append(new_path)
+                else:
+                    stack.append(((newx, newy), new_path))
+                visited[newx][newy] = 1
+
+    return paths
+        
+
+
+mat = mkmat(lines)
+expansion = empty_spaces(mat)
+#mat = expand_mat(mat)
+coords = galaxies(mat)
+dists = manhattendistances(coords, expansion)
+s = 0
+for d in dists:
+   # print(len(d))
+    s += sum(d)
+print(s//2)
+

python/inputs/day11.txt

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python/inputs/day11_ex.txt

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+...#......
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