From c0521b1fd55039e19bb839e246a60ad80af0c57a Mon Sep 17 00:00:00 2001
From: Frederik Baerentsen <frederik@baerentsen.net>
Date: Sat, 16 Dec 2023 23:19:28 -0500
Subject: [PATCH] Finished 2023-12-16 p2

---
 2023/day16/part2.py | 201 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 201 insertions(+)
 create mode 100644 2023/day16/part2.py

diff --git a/2023/day16/part2.py b/2023/day16/part2.py
new file mode 100644
index 0000000..72ef9e2
--- /dev/null
+++ b/2023/day16/part2.py
@@ -0,0 +1,201 @@
+import sys
+import os
+from pprint import pprint
+import time
+import math
+
+import functools
+
+#colors
+from termcolor import colored
+
+sys.setrecursionlimit(5000)
+
+start_time = time.time()
+
+grid = []
+
+def p(x,*args):
+    for idx,i in enumerate(x):
+        for jdx,j in enumerate(i):
+            if j == '#':
+                print(colored(j,'red'),end='')
+            elif len(args) > 0:
+                if (idx,jdx) == args[1]:
+                    print(colored(j,'red'),end='')
+                elif (idx,jdx) in args[0]:
+                    print(colored(j,'green'),end='')
+                else:
+                    print(j,end='')
+            else:
+                print(j,end='')
+        print()
+
+input_f = ''
+if len(sys.argv) == 1:
+    input_f = 'test'
+else:
+    input_f = sys.argv[1]
+
+with open(input_f) as file:
+    for line in file:
+        grid.append(list(line.rstrip()))
+
+#@functools.cache
+def travel(grid,l,direction,visited,seen):
+    current = (l[0],l[1])
+
+    try:
+        if seen[current] == direction:
+            return
+    except:
+        seen[current] = direction
+
+
+    if len(sys.argv) == 3:
+        p(grid,visited,current)
+        print()
+        time.sleep(float(sys.argv[2]))
+
+    r = l[0]
+    c = l[1]
+    next_loc = ()
+
+    #if r >= len(grid) or c >= len(grid[0]) or r < 0 or c < 0:
+    #    return
+    #else:
+    #print('Current: ' + str(current) + ' [' + grid[r][c] + ']', end=' ')
+    #print('Current: ' + str(current) , end=' ')
+    #print('moving ' + direction + ' to ',end='')
+
+    if direction == 'r':
+        #print(str((r,c+1)))
+        if c+1 < len(grid[0]):
+            next_loc = (r,c+1)
+        else:
+            return
+        #travel(n,c+1,'r')
+    
+    if direction == 'l':
+        #print(str((r,c-1)))
+        if c-1 >= 0:
+            next_loc = (r,c-1)
+        else:
+            return 
+        #travel(n,c-1,'l')
+    
+    if direction == 'd':
+        #print(str((r+1,c)))
+        if r+1 < len(grid):
+            next_loc = (r+1,c)
+        else:
+            return
+        #travel(n+1,c,'d')
+
+    if direction == 'u':
+        #print(str((r-1,c)))
+        if r-1 >= 0:
+            next_loc = (r-1,c)
+        else:
+            return
+        #travel(n-1,c,'u')
+    
+    visited.append(next_loc)
+
+    match grid[next_loc[0]][next_loc[1]]:
+        case '.':
+            travel(grid,next_loc,direction,visited,seen)
+        case '|':
+            if direction == 'l' or direction == 'r':
+                travel(grid,next_loc,'u',visited,seen)
+                travel(grid,next_loc,'d',visited,seen)
+            else:
+                travel(grid,next_loc,direction,visited,seen)
+
+        case '\\':
+            if direction == 'r':
+                travel(grid,next_loc,'d',visited,seen)
+            if direction == 'l':
+                travel(grid,next_loc,'u',visited,seen)
+            if direction == 'd':
+                travel(grid,next_loc,'r',visited,seen)
+            if direction == 'u':
+                travel(grid,next_loc,'l',visited,seen)
+
+        case '-':
+            if direction == 'u' or direction == 'd':
+                travel(grid,next_loc,'r',visited,seen)
+                travel(grid,next_loc,'l',visited,seen)
+            else:
+                travel(grid,next_loc,direction,visited,seen)
+
+        case '/':
+            if direction == 'r':
+                travel(grid,next_loc,'u',visited,seen)
+            if direction == 'l':
+                travel(grid,next_loc,'d',visited,seen)
+            if direction == 'd':
+                travel(grid,next_loc,'l',visited,seen)
+            if direction == 'u':
+                travel(grid,next_loc,'r',visited,seen)
+    return visited
+
+def print_visited(x,visited):
+    for idx,i in enumerate(x):
+        for jdx,j in enumerate(i):
+
+            if (idx,jdx) in visited:
+                print(colored('#','red'),end='')
+            else:
+                print(j,end='')
+
+        print()
+
+
+starting_points = []
+
+longest = 0
+visited = []
+
+seen = {}
+
+
+for i in range(len(grid)):
+    cords = (i,-1)
+    visited = []
+    seen = {}
+    travel(grid,cords,'r',visited,seen)
+    if len(set(visited)) > longest:
+        longest = len(set(visited))
+
+for i in range(0,len(grid[0])):
+    cords = (-1,i)
+    visited = []
+    seen = {}
+    travel(grid,cords,'d',visited,seen)
+    if len(set(visited)) > longest:
+        longest = len(set(visited))
+
+for i in range(len(grid)):
+    cords = (i,len(grid))
+    visited = []
+    seen = {}
+    travel(grid,cords,'l',visited,seen)
+    if len(set(visited)) > longest:
+        longest = len(set(visited))
+
+for i in range(0,len(grid[0])):
+    cords = (len(grid),i)
+    visited = []
+    seen = {}
+    travel(grid,cords,'u',visited,seen)
+    if len(set(visited)) > longest:
+        longest = len(set(visited))
+
+print(longest)
+print("--- %s seconds ---" % (time.time() - start_time))
+
+
+
+
+