Solve day 17

17_reservoir.py

@@ -0,0 +1,96 @@
+#!/usr/bin/env python3
+import sys
+
+SAND, CLAY, DROP, STILL = 1, 2, 4, 8
+WALL = CLAY | STILL
+WATER = DROP | STILL
+
+def parse():
+    ranges = []
+    for line in sys.stdin:
+        x, y = line.rstrip().split(', ')
+        if x[0] == 'y':
+            x, y = y, x
+        x = tuple(map(int, x[2:].split('..'))) if '..' in x else (int(x[2:]),) * 2
+        y = tuple(map(int, y[2:].split('..'))) if '..' in y else (int(y[2:]),) * 2
+        ranges.append(x + y)
+
+    padding = 1
+    xmin = min(min(min(r[:2]) for r in ranges), 500) - padding
+    ymin = min(min(r[2:]) for r in ranges)
+    ranges = [(xstart - xmin, xend - xmin, ystart - ymin, yend - ymin)
+            for xstart, xend, ystart, yend in ranges]
+
+    w = max(max(r[:2]) for r in ranges) + 1 + 2 * padding
+    h = max(max(r[2:]) for r in ranges) + 1
+    grid = w * h * [SAND]
+
+    for xstart, xend, ystart, yend in ranges:
+        for y in range(ystart, yend + 1):
+            for x in range(xstart, xend + 1):
+                grid[y * w + x] = CLAY
+
+    grid[500 - xmin] = DROP
+    return grid, w
+
+def show(grid, w):
+    source = grid.index(DROP)
+    print('.' * source + '+' + '.' * (w - source - 1))
+    for y in range(len(grid) // w):
+        print(''.join('.#|~'[x] for x in grid[y * w:(y + 1) * w]))
+
+def flow(grid, w):
+    h = len(grid) // w
+
+    def expand(water, step):
+        water += step
+        while grid[water + w] & WALL and not grid[water] & WALL:
+            water += step
+        return water
+
+    def drop(water):
+        while water // w < h - 1:
+            water += w
+
+            if grid[water] == DROP:
+                break
+            elif grid[water] & WALL:
+                # floor hit, rise while trapped between walls of clay
+                lwall = rwall = True
+                while lwall and rwall:
+                    water -= w
+                    left = expand(water, -1)
+                    right = expand(water, 1)
+                    lwall = grid[left] & WALL
+                    rwall = grid[right] & WALL
+                    fill = STILL if lwall and rwall else DROP
+                    for i in range(left + 1, right):
+                        grid[i] = fill
+
+                # break condition above checks fow clay and water, but we only
+                # keep flowing through sand
+                lflow = not lwall and grid[left] == SAND
+                rflow = not rwall and grid[right] == SAND
+
+                if lflow and rflow:
+                    # flow continues on both ends, fork
+                    grid[left] = DROP
+                    drop(left)
+                    water = right
+                elif lflow:
+                    water = left
+                elif rflow:
+                    water = right
+                else:
+                    break
+
+            # drop down
+            grid[water] = DROP
+
+    drop(grid.index(DROP))
+
+grid, w = parse()
+flow(grid, w)
+#show(grid, w)
+print(sum(1 for x in grid if x & WATER))
+print(grid.count(STILL))

input/17

@@ -0,0 +1,2043 @@
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