day 3 part 2

2018/day-3/python/main.py

@@ -4,12 +4,12 @@ import os, sys, pyperclip, re
 def parse(string):
     match = re.search(pattern, string)
     # return int(match[1]), int(match[2]), int(match[3]), int(match[4])
-    return list(map(int, [match[i] for i in range(1, 5)]))
+    return list(map(int, [match[i] for i in range(1, 6)]))
 
 # I only later figured out that the dimensions were simply 1000 x 1000
 # but this now allows it to be of any dimension
 def dimensions(data):
-    def bottomright(x, y, width, height):
+    def bottomright(id, x, y, width, height):
         return (x + width, height + y)    
     bottomrights = list(map(lambda dat : bottomright(*dat), data))
     matrix_x = max(bottomrights, key=lambda item : item[0])[0]
@@ -18,18 +18,35 @@ def dimensions(data):
 
 path = os.path.join(sys.path[0], '..', 'input')
 data = open(path, 'r').read().split('\n')
-pattern = r'#\d+ @ (\d+),(\d+): (\d+)x(\d+)'
+pattern = r'#(\d+) @ (\d+),(\d+): (\d+)x(\d+)'
 data = list(map(parse, data))
 WIDTH, HEIGHT = dimensions(data)
-matrix = [[0 for y in range(WIDTH)] for x in range(HEIGHT)]
+matrix = [[[set(), 0] for y in range(WIDTH)] for x in range(HEIGHT)]
 
-for offset_x, offset_y, width, height in data:
+for id, offset_x, offset_y, width, height in data:
     for x in range(width):
         for y in range(height):
             # matrix[offset_x + x][offset_y + y] = min(2, 1 + matrix[offset_x + x][offset_y + y])
-            matrix[offset_x + x][offset_y + y] += 1
+            newX, newY = offset_x + x, offset_y + y
-            
+            matrix[newX][newY][1] += 1
-# count = sum(map(lambda x : x.count(2), matrix))
+            matrix[newX][newY][0].add(id) 
-count = sum(map(lambda item : len(list(filter(lambda i : i >= 2, item))), matrix))
+
+# Checks whether a specific span has any overlaps
+def check(offset_x, offset_y, width, height):
+    for x in range(width):
+        for y in range(height):
+            newX, newY = offset_x + x, offset_y + y
+            # Quit as soon as the span has been invalidated
+            if len(matrix[newX][newY][0]) > 1:
+                return False
+    return True
+
+# Count all the points in the matrix
+count = sum(map(lambda item : len(list(filter(lambda i : i[1] >= 2, item))), matrix))
 print(count)
-pyperclip.copy(count)
+
+# Checks every id
+for dat in data:
+    if check(*dat[1:]):
+        print(dat[0])
+        break