July 2015
Intermediate to advanced
286 pages
6h 31m
English
Content preview from Mazes for Programmers
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Implementing the Recursive Backtracker
We’re going to implement more or less what was described in the previous section, using an explicit stack to manage the cells that have been visited. We’ll use an array to represent the stack (which is easy in Ruby, since Ruby’s arrays come preloaded with the standard push and pop stack operators). Put the following code in recursive_backtracker.rb.
| recursive_backtracker.rb | |
| Line 1 | class RecursiveBacktracker |
| - | |
| - | def self.on(grid, start_at: grid.random_cell) |
| - | stack = [] |
| 5 | stack.push start_at |
| - | |
| - | while stack.any? |
| - | current = stack.last |
| - | neighbors = current.neighbors.select { |n| n.links.empty? } |
| 10 | |
| - | if neighbors.empty? |
| - | stack.pop |
| - | else |
| - | neighbor = neighbors.sample |
| 15 | current.link(neighbor) ... |
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