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everyone who/whom 7 legs of love :marseyspider:  2yr ago (text post) 261 thread views #130717

Day 12

Post code, nerds.

14
New Old Top Bottom Controversial Random
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Implemented my own totally faggy version of a-star. Edit: Included both variants in my result

with open('input12.txt') as file:
    lines = [[ord(c)-ord('a') for c in list(line.strip())] for line in file] # -14 == S # -28 == E
    
class Node():
    def __init__(self,x ,y, steps, cost) -> None:
        self.x = x
        self.y = y
        self.height = lines[y][x]
        self.steps = steps
        if self.height == -28:
            self.height = 25
        elif self.height == -14:
            self.height = 0
        self.cost = self.steps + self.height
        
def check_neighbours(node_next_x, node_next_y, node, x_axis=True, reverse=False):
    if (x_axis and 0 <= node_next_x < len(lines[node_next_y])) or (not x_axis and 0 <= node_next_y < len(lines)):
        if reverse:
            height_diff = node.height-lines[node_next_y][node_next_x]
        else:
            height_diff = lines[node_next_y][node_next_x]-node.height
        if "{}/{}/{}/{}".format(node_next_x,node_next_y,node.x,node.y) not in looked_set and height_diff<=1:
            new_node = Node(node_next_x, node_next_y, node.steps+1, node.cost)
            node_list.append(new_node)
            looked_set.add("{}/{}/{}/{}".format(node_next_x,node_next_y,node.x,node.y))
    
part_a=True # False for part b
        
node_list = []
looked_set = set()
if part_a:
    start = Node(0,20,0,0)
    goal = -28
    pre_goal_height = 25
else:
    start = Node(40,20,0,0)
    goal = 0
    pre_goal_height = 1
node_list.append(start)
index = 0
while True:
    if len(node_list) == 0:
        print("Nothing found")
        break
    node = node_list.pop()
    if index%1000 == 0:
        print("here", node.steps, len(node_list))
    if node.height == pre_goal_height:
        if goal in [lines[node.y+1][node.x],lines[node.y-1][node.x],lines[node.y][node.x+1],lines[node.y][node.x-1]]:
            print("Found! Steps:", node.steps+1)
            break
    check_neighbours(node.x+1, node.y, node, True, not part_a)
    check_neighbours(node.x-1, node.y, node, True, not part_a)
    check_neighbours(node.x, node.y+1, node, False, not part_a)
    check_neighbours(node.x, node.y-1, node, False, not part_a)
    node_list.sort(key=lambda n: n.cost, reverse=True)
    index += 1
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