Solved 2024/12 P2

2024/12/12.md

@@ -123,8 +123,6 @@ So, it has a total price of `1930`.
 
 Your puzzle answer was `1437300`.
 
-The first half of this puzzle is complete! It provides one gold star: \*
-
 ## \-\-- Part Two \-\-- {#part2}
 
 Fortunately, the Elves are trying to order so much fence that they
@@ -203,8 +201,14 @@ Adding these together produces its new total price of `1206`.
 
 *What is the new total price of fencing all regions on your map?*
 
-Answer:
+Your puzzle answer was `849332`.
 
-Although it hasn\'t changed, you can still [get your puzzle
+Both parts of this puzzle are complete! They provide two gold stars:
+\*\*
+
+At this point, you should [return to your Advent calendar](/2024) and
+try another puzzle.
+
+If you still want to see it, you can [get your puzzle
 input](12/input).
 

2024/12/solution.py

@@ -1,11 +1,12 @@
 #!/bin/python3
 import sys,time,re
 from pprint import pprint
+import numpy as np
 sys.path.insert(0, '../../')
 from fred import list2int,get_re,nprint,lprint,loadFile,toGrid,bfs,get_value_in_direction,addTuples,grid_valid
 start_time = time.time()
 
-input_f = 'test'
+input_f = 'input'
 
 #########################################
 #                                       #
@@ -78,7 +79,7 @@ def part1():
 
 
 start_time = time.time()
-print('Part 1:',part1(), '\t\t', round((time.time() - start_time)*1000), 'ms')
+print('Part 1:',part1(), '\t', round((time.time() - start_time)*1000), 'ms')
 
 
 #########################################
@@ -104,14 +105,15 @@ def get_neighbors_and_corners(grid,node,visited):
                 neighbors.append(n)
                 visited.append(n)
                 neighbors += get_neighbors_and_corners(grid,n,visited)
-   
 
-    
     return neighbors
 
+def rotate_90_clockwise(grid:list) -> list:
+    return [list(row) for row in zip(*grid[::-1])]
+
 def part2():
     grid = toGrid(input_f)
-
+    #print(grid)
     #nprint(grid)
     values = {}
     visited = []
@@ -136,7 +138,7 @@ def part2():
 
     for pdx,p in enumerate(total_plots):
         total_plots[pdx] = sorted(p)
-    pprint(total_plots)
+    #pprint(total_plots)
 
     #directions = [(0, 1), (0, -1), (1, 0), (-1, 0)]
     directions = [(0, 1), (1, 0)]
@@ -164,13 +166,46 @@ def part2():
             print(end)
 
     for p in total_plots:
+        area = len(p)
+        fences = 0
         for r,c in p:
             visited = []
-            print('@',(r,c))
-            
-            find_edge(r,c,p,visited)
-            input()
+            #print('@',(r,c),get_value_in_direction(grid,(r,c)))
 
+
+            if get_value_in_direction(grid,(r,c),'up') != grid[r][c] and get_value_in_direction(grid,(r,c),'left') != grid[r][c]:
+                #print('┌ corner - up+left')
+                fences+=1
+            if get_value_in_direction(grid,(r,c),'up') == grid[r][c] and get_value_in_direction(grid,(r,c),'left') == grid[r][c] and get_value_in_direction(grid,(r,c),'up-left') != grid[r][c]:
+                #print('└ corner - up+left+upleft')
+                fences+=1
+
+            if get_value_in_direction(grid,(r,c),'left') != grid[r][c] and get_value_in_direction(grid,(r,c),'down') != grid[r][c]:
+                #print('└ corner - left+down')
+                fences+=1
+            if get_value_in_direction(grid,(r,c),'left') == grid[r][c] and get_value_in_direction(grid,(r,c),'down') == grid[r][c] and get_value_in_direction(grid,(r,c),'down-left') != grid[r][c]:
+                #print('┐ corner - left+down+downleft')
+                fences+=1
+
+            if get_value_in_direction(grid,(r,c),'down') != grid[r][c] and get_value_in_direction(grid,(r,c),'right') != grid[r][c]:
+                #print('┘ corner - down+right')
+                fences+=1
+            if get_value_in_direction(grid,(r,c),'down') == grid[r][c] and get_value_in_direction(grid,(r,c),'right') == grid[r][c] and get_value_in_direction(grid,(r,c),'down-right') != grid[r][c]:
+                #print('┌ corner - down+right+downright')
+                fences+=1
+
+            if get_value_in_direction(grid,(r,c),'right') != grid[r][c] and get_value_in_direction(grid,(r,c),'up') != grid[r][c]:
+                #print('┐ corner - right+up')
+                fences+=1
+            if get_value_in_direction(grid,(r,c),'right') == grid[r][c] and get_value_in_direction(grid,(r,c),'up') == grid[r][c] and get_value_in_direction(grid,(r,c),'up-right') != grid[r][c]:
+                #print('└ corner - right+up+upright')
+                fences+=1
+            #┌ ┐
+            #└ ┘
+            #input()
+
+        result+=(area*fences)
+            
     # for v in total_plots:
     #     total_corners = 0    
     #     corners = 0

fred.py

@@ -356,7 +356,7 @@ def ppprint(x):
             print(x[idx][jdx], end='')
         print()
 
-def get_value_in_direction(grid, position, direction=None, length=1, type: str = None):
+def get_value_in_direction(grid:list, position:set, direction:str=None, length:int=1, type: str = None):
     """
     Get the value(s) in a specified direction from a given position in a grid.
     If no direction is provided, returns the value at the current position.