Created
April 2, 2015 02:38
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| class Node(object): | |
| def __init__(self, _children): | |
| self.memo = None | |
| self.children = _children | |
| dest = Node([]) | |
| source = Node([ | |
| dest, # source -> dest | |
| Node([dest]), # source -> intermediate -> dest | |
| Node([Node([dest])]), # source -> a -> b -> dest | |
| Node([]) # source -> intermediate -> nothing | |
| ]) | |
| def paths_to_dest(node): | |
| if node == dest: | |
| return 1 | |
| else: | |
| if node.memo is None: | |
| node.memo = sum([paths_to_dest(child) for child in node.children]) | |
| return node.memo | |
| print paths_to_dest(source) |
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