import time
from collections import deque
class Node:
def __init__(self, x, y, saldo, grid):
self.x = x
self.y = y;
self.saldo = saldo
self.grid = grid
def __hash__(self):
return self.x ^ self.y
def __eq__(self, other):
return self.x == other.x and self.y == other.y
def get_neighbors(self):
neighbors = []
x = self.x
y = self.y
saldo = self.saldo
grid = self.grid
rows = len(grid)
columns = len(grid[0])
if x > 0:
wall = grid[y][x - 1] == 1
if wall:
if saldo > 0:
neighbors.append(Node(x - 1, y, saldo - 1, grid))
else:
neighbors.append(Node(x - 1, y, saldo, grid))
if x < columns - 1:
wall = grid[y][x + 1] == 1
if wall:
if saldo > 0:
neighbors.append(Node(x + 1, y, saldo - 1, grid))
else:
neighbors.append(Node(x + 1, y, saldo, grid))
if y > 0:
wall = grid[y - 1][x] == 1
if wall:
if saldo > 0:
neighbors.append(Node(x, y - 1, saldo - 1, grid))
else:
neighbors.append(Node(x, y - 1, saldo, grid))
if y < rows - 1:
wall = grid[y + 1][x]
if wall:
if saldo > 0:
neighbors.append(Node(x, y + 1, saldo - 1, grid))
else:
neighbors.append(Node(x, y + 1, saldo, grid))
return neighbors
class GridEscapeRouter:
def __init__(self, grid, saldo):
self.grid = grid
self.rows = len(grid)
self.columns = len(grid[0])
self.saldo = saldo
def get_escape_route_length(self):
source = Node(0, 0, self.saldo, self.grid)
queue = deque([source])
distance_map = {source: 1}
print distance_map
while queue:
current_node = queue.popleft()
if current_node.x == self.columns - 1 and\ current_node.y == self.rows - 1:
return distance_map[current_node]
for child_node in current_node.get_neighbors():
if child_node not in distance_map.keys():
distance_map[child_node] = distance_map[current_node] + 1
queue.append(child_node)
return 1000 * 1000 * 1000 # Cannot escape
def milliseconds():
return int(round(time.time() * 1000))
start_time = milliseconds()
router = GridEscapeRouter(
[[0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1],
[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]],
1)
route_length = router.get_escape_route_length();
end_time = milliseconds()
print "Route length", route_length, "in", end_time - start_time, "milliseconds."
router = GridEscapeRouter([[0, 1, 1, 0],
[0, 0, 0, 1],
[1, 1, 0, 0],
[1, 1, 1, 0]],
1)
print router.get_escape_route_length()
router = GridEscapeRouter([[0, 0, 0, 0, 0, 0],
[1, 1, 1, 1, 1, 0],
[0, 0, 0, 0, 0, 0],
[0, 1, 1, 1, 1, 1],
[0, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 0]],
1)
print router.get_escape_route_length()
About Online Python Compiler
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- And, many more.
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