day18 almost

2022/python/day18.py

@@ -4,6 +4,11 @@ from pprint import pprint
 from dataclasses import dataclass
 from typing import Set, Tuple
 from functools import cached_property
+from mpl_toolkits.mplot3d import Axes3D
+import numpy as np
+import matplotlib.pyplot as plt
+
+
 
 
 @dataclass
@@ -31,12 +36,24 @@ def get_neighbors(x,y,z):
            (0,0,-1),# 5 
            (-1,0,0) # 6 
         )
-        neighbor_coords = set([(x+o[0], y+o[1], z+o[2]) for o in offsets])
+        return set([(x+o[0], y+o[1], z+o[2]) for o in offsets])
-        return neighbor_coords
 
-def count_neighbor_coords(x,y,z):
+def get_flat_neighbors(x,y,z):
-    pass
+        # Generate the six neighbor_coords
+        # Look at a die 6 to the left, 2 on top, one on right 
+        # ignore top and bottom
+        offsets = (
+           (1,0,0), # 1 
+           #(0,0,1), # 2 
+           (0,-1,0),# 3 
+           (0,1,0), # 4 
+           #(0,0,-1),# 5 
+           (-1,0,0) # 6 
+        )
+        return set([(x+o[0], y+o[1], z+o[2]) for o in offsets])
         
+def get_flat_neighbors_from(x,y,z, f):
+    return get_flat_neighbors(x,y,z).intersection(f)
 
 
 # @shared.profile
@@ -53,7 +70,7 @@ def part1(rows):
 
 
 
-def part2(rows):
+def surface_area(rows):
     cubes = {}
     maxX,maxY,maxZ = 0,0,0
     for idx, (x,y,z) in enumerate(rows):
@@ -68,77 +85,92 @@ def part2(rows):
         for other in cube['not_me']:
             if other in cube['n']:
                 potential -= 1
+    return potential, maxX,maxY,maxZ, cubes, _cubes
+
+
+def part2(rows):
+    potential, maxX, maxY,maxZ,cubes,_cubes = surface_area(rows)
+
 
     air = set()
     for x in range(0,maxX+1):
         for y in range(0,maxY+1):
             for z in range(0,maxZ+1):
+                if (x,y,z) not in _cubes:
                     air.add((x,y,z))
     air -= _cubes # Remove all lava from air
+    all_air_count = len(air)
+    all_lava_count = len(_cubes)
+    possible_count = (maxX+1)*(maxY+1)*(maxZ+1)
 
+    print("all_air: ", all_air_count)
+    print("all_lava:", all_lava_count)
+    print("possible:", possible_count)
+    print(maxZ,maxY,maxX)
+    print()
+
+    air_nx = {}
     for a in air:
         neighbors = get_neighbors(*a)
-        if len(neighbors & _cubes)==6:
+        air_nx[a] = {
-            #print(a, "====", neighbors & _cubes)
+                'lava':neighbors & _cubes or None,
-            potential -= 6
+                'air': neighbors & air or None
+                }
 
-
+    # loop row by row
-    #            _ns = get_neighbors(x,y,z)
+    inside = []
-    #            lava_neighbors = _ns & _cubes
-    #            if len(lava_neighbors) == 6:
-    #                potential -= 6
-    print(potential)
-
-
-
-# @shared.profile
-def _part2(rows):
-    cubes = []
-
-    _lava = set()
-    for row in rows:
-        x,y,z = row
-        maxX = max(maxX,x)
-        maxY = max(maxY,y)
-        maxZ = max(maxZ,z)
-        cube = Cube(x=x,y=y,z=z)
-        cube.set_neighbor_coords()
-        cubes.append(cube)
-        _lava.add((x,y,z))
-    print(maxX,maxY,maxZ)
-
-    potential = len(cubes) * 6
-    for idx in range(len(cubes)):
-        cube = cubes[idx] 
-        others = cubes[:idx] + cubes[idx+1:]
-        for other in others:
-            if other.xyz in cube.neighbor_coords:
-                potential -= 1
-
-
-    air = []
-    for x in range(0,maxX+1):
-        for y in range(0,maxY+1):
     for z in range(0,maxZ+1):
-                lava_count = 0
+        seen = set()
-                if (x,y,z) in _lava:
+        seen.add((0,0,z))
+        for y in range(0,maxY+1):
+            for x in range(0,maxX+1):
+                xyz = (x,y,z)
+                if xyz in _cubes:
+                    #print(xyz,'is cube')
                     continue
+                ns = get_flat_neighbors_from(x,y,z, air)
+                for neigh in ns:
+                    if neigh in seen and neigh not in _cubes:
+                        seen.add(xyz)
+        this_level = air_in_row(air, z)
+        print(this_level, seen)
+        print(len(this_level), len(seen))
+        inside.extend([x for x in this_level if x not in seen])
+    #print()
+    #print(inside)
+    #print()
+    actually_inside = []
+    for i in inside:
+        ns = get_neighbors(*i)
+        # check for surrounded 100% by rock
+        rock_count = 0
+        for n in ns:
+            if n in _cubes:
+                rock_count +=1
+        if rock_count == 6:
+            print("in rock")
+            actually_inside.append(i)
+            continue
+        #check for surrounded 100% by air
+        air_count = 0
+        for n in ns:
+            if n in air:
+                air_count +=1
+                print("in air")
+                break
+            actually_inside.append(i)
+    #print(actually_inside)
+    tot, _, _, _, _, _ = surface_area(actually_inside)
+    print(tot)
+    print(potential - tot)
+    shared.render_cubes(maxX,maxY,maxZ, [x for x in actually_inside])
 
-                # is air
+def air_in_row(air, z):
-                air_touching_lava = False
+    x = []
-                for _n in _ns:
+    for a in air:
-                    if _n in _lava:
+        if a[2] == z:
-                        lava_count += 1
+            x.append(a)
-                        air_touching_lava = True
+    return x
-
-                if air_touching_lava:
-                    air.append((x,y,z))
-
-                if lava_count == 6:
-                    potential -= 6
-                        
-
-    print(potential, air)
 
 
 

2022/python/shared.py

@@ -102,3 +102,60 @@ def elapsed_timer():
     yield lambda: elapser()
     end = default_timer()
     elapser = lambda: end - start
+
+
+
+
+def render_cubes(maxX,maxY,maxZ, my_cubes):
+    from mpl_toolkits.mplot3d import Axes3D
+    import numpy as np
+    import matplotlib.pyplot as plt
+    from mpl_toolkits.mplot3d.art3d import Poly3DCollection
+    
+    def cuboid_data(o, size=(1,1,1)):
+        X = [[[0, 1, 0], [0, 0, 0], [1, 0, 0], [1, 1, 0]],
+             [[0, 0, 0], [0, 0, 1], [1, 0, 1], [1, 0, 0]],
+             [[1, 0, 1], [1, 0, 0], [1, 1, 0], [1, 1, 1]],
+             [[0, 0, 1], [0, 0, 0], [0, 1, 0], [0, 1, 1]],
+             [[0, 1, 0], [0, 1, 1], [1, 1, 1], [1, 1, 0]],
+             [[0, 1, 1], [0, 0, 1], [1, 0, 1], [1, 1, 1]]]
+        X = np.array(X).astype(float)
+        for i in range(3):
+            X[:,:,i] *= size[i]
+        X += np.array(o)
+        return X
+    
+    def plotCubeAt(positions,sizes=None,colors=None, **kwargs):
+        if not isinstance(colors,(list,np.ndarray)): colors=["C0"]*len(positions)
+        if not isinstance(sizes,(list,np.ndarray)): sizes=[(1,1,1)]*len(positions)
+        g = []
+        for p,s,c in zip(positions,sizes,colors):
+            g.append( cuboid_data(p, size=s) )
+        return Poly3DCollection(np.concatenate(g),  
+                                facecolors=np.repeat(colors,6, axis=0), **kwargs)
+    
+    N1 = maxX
+    N2 = maxY
+    N3 = maxZ
+    ma = np.random.choice([0,1], size=(N1,N2,N3), p=[0.99, 0.01])
+    x,y,z = np.indices((N1,N2,N3))-.5
+    #positions = np.c_[x[ma==1],y[ma==1],z[ma==1]]
+    positions = np.c_[my_cubes]
+    colors= np.random.rand(len(positions),3)
+    
+    fig = plt.figure()
+    ax = fig.add_subplot(projection='3d')
+    ax.set_aspect('equal')
+    
+    pc = plotCubeAt(positions, colors=colors,edgecolor="k")
+    ax.add_collection3d(pc)
+    
+    ax.set_xlim([0,maxX])
+    ax.set_ylim([0,maxY])
+    ax.set_zlim([0,maxZ])
+    #plotMatrix(ax, ma)
+    #ax.voxels(ma, edgecolor="k")
+    
+    plt.show()
+
+