day 9 cheated kinda :c

day9/2.py

@@ -4,52 +4,74 @@ with open(r'day9/input.txt', 'r') as input:
 def surface(a,b):
     return (abs(a[0]-b[0])+1)*(abs(a[1]-b[1])+1)
 
-inner = set()
+dim = [100000,100000]
+
+hotspots = set()
+
+border = set()
 
 for i in range(len(lines)):
+    hotspots.add(lines[i][0])
+    hotspots.add(lines[i][0]-1)
+    hotspots.add(lines[i][0]+1)
+    hotspots.add(lines[i][1])
+    hotspots.add(lines[i][1]-1)
+    hotspots.add(lines[i][1]+1)
     j = (i+1)%len(lines)
     if lines[i][0] == lines[j][0]:
         sign = 1 if lines[i][1] <= lines[j][1] else -1
         for x in range(lines[i][1],lines[j][1],sign):
-            inner.add((lines[i][0],x))
+            border.add((lines[i][0],x))
     else: 
         sign = 1 if lines[i][0] <= lines[j][0] else -1
         for x in range(lines[i][0],lines[j][0],sign):
-            inner.add((x,lines[i][1]))
+            border.add((x,lines[i][1]))
 
-if lines[0][0] == lines[1][0]:
+print(hotspots)
-    init = (lines[0][0]-1,lines[0][1]+1)
-else:
-    init = (lines[0][0]+1,lines[0][1]+1)
 
-print(init)
+def is_point_inside(a):
+    # up, down, left, right
+    ranges = [[0,a[1]],[a[1],dim[1]],[a[0],dim[0]],[0,a[0]]]
+    for j in range(4):
+        count = 0
+        last = False
+        for i in hotspots:
+            if i < ranges[j][0] or i > ranges[j][1]: continue
+            coord = (a[0],i) if j < 2 else (i,a[1])
+            if coord in border: last = True
+            elif last and coord not in border: 
+                last = False
+                count +=1
+        if count%2 == 0:
+            return False
+    return True
 
-L=[init]
+def is_rect_inside(a,b):
-neigh = [[-1,0],[-1,-1],[0,-1],[1,0],[0,1],[1,1],[-1,1],[1,-1]]
+    precision = 1000
-while len(L):
+    upper_left = (min(a[0],b[0]),min(a[1],b[1]))
-    sommet = L.pop(0)
+    lower_right = (max(a[0],b[0]),max(a[1],b[1]))
-    if sommet not in inner:
+    upper_right = (max(a[0],b[0]),min(a[1],b[1]))
-        inner.add(sommet)
+    lower_left = (min(a[0],b[0]),max(a[1],b[1]))
-        for nei in neigh:
+    upper_border = (range(upper_left[0],upper_right[1],precision),[upper_left[1]])
-            new = (sommet[0]+nei[0],sommet[1]+nei[1])
+    lower_border = (range(lower_left[0],lower_right[0],precision),[lower_left[1]])
-            if new not in inner and new not in L:
+    right_border = ([lower_right[0]], range(upper_right[1],lower_right[1],precision))
-                L.append(new)
+    left_border = ([lower_left[0]],range(upper_left[1],lower_left[0],precision))
     
-print("init done")
+    for border_2 in [upper_border,lower_border,left_border,right_border]:
-
+        for i in border_2[0]:
-def is_inside(a,b):
+            for j in border_2[1]:
-    for i in range(min(a[0],b[0]),max(a[0],b[0])+1):
+                if (i,j) not in border and not is_point_inside((i,j)):
-        for j in range(min(a[1],b[1]),max(a[1],b[1])+1):
-            if (i,j) not in inner:
                     return False
     return True
 
 best = surface(lines[0],lines[1])
 
 for i in range(len(lines)):
+    print(i,len(lines))
     for j in range(i):
-        if is_inside(lines[i],lines[j]):
+        if surface(lines[i],lines[j]) > best and is_rect_inside(lines[i],lines[j]):
             best = max(best,surface(lines[i],lines[j]))
+            print("new best found")
 
 print(best)
 

day9/2cheat.py

@@ -0,0 +1,34 @@
+import shapely
+from shapely.geometry import Point, Polygon
+
+with open(r'day9/input.txt', 'r') as input:
+    lines = list(map(lambda x: list(map(lambda y: int(y),x.split(','))),input.read().split('\n')[:-1]))
+
+points = []
+
+def surface(a,b):
+    return (abs(a.x-b.x)+1)*(abs(a.y-b.y)+1)
+
+
+for line in lines:
+    points.append(Point(line[0],line[1]))
+
+points.append(points[0])
+
+polygon = Polygon([p.x,p.y] for p in points)
+
+bestarea = shapely.area(shapely.box(0,0,0,0))
+
+for i in range(len(points)):
+    print(i)
+    for j in range(i):
+        minx = min(points[i].x,points[j].x)
+        miny = min(points[i].y,points[j].y)
+        maxx = max(points[i].x,points[j].x)
+        maxy = max(points[i].y,points[j].y)
+        box = shapely.box(minx,miny,maxx,maxy)
+        box_surface = surface(points[i],points[j]) 
+        if box_surface > bestarea and shapely.contains(polygon,box):
+            bestarea = box_surface
+print(bestarea)
+