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| class Tree : | |
| def __init__(self, data = None): | |
| self._data = data | |
| self._HD = 0 | |
| self._left = None | |
| self._right = None | |
| def show(self): | |
| return self._data | |
| def left(self): | |
| return self._left | |
| def right(self): | |
| return self._right | |
| def put(self, data): | |
| self._data = data | |
| def tree_show(temp): | |
| if temp == None: | |
| return | |
| else: | |
| tree_show(temp.left()) | |
| print(temp.show(), temp._HD) | |
| tree_show(temp.right()) | |
| def level_traversal(root): | |
| queue = [] | |
| temp = root | |
| while temp != None: | |
| if temp.left() != None: | |
| queue.append(temp.left()) | |
| if temp.right() != None: | |
| queue.append(temp.right()) | |
| yield temp # Generators. Thus this function can be iterated over by for loops | |
| try: | |
| temp = queue.pop(0) | |
| except IndexError: | |
| temp = None | |
| print("Done\n") | |
| return | |
| def calculate_HD(root, value): | |
| if root == None: | |
| return | |
| else: | |
| root._HD = value | |
| calculate_HD(root.left(), value - 1) | |
| calculate_HD(root.right(), value + 1) | |
| root = Tree(1) | |
| root._left = Tree(2) | |
| root._right = Tree(3) | |
| root._left._right = Tree(4) | |
| root._left._right._right = Tree(5) | |
| root._left._right._right._right = Tree(6) | |
| top_view = dict() | |
| calculate_HD(root, 0) | |
| for node in level_traversal(root): | |
| if node._HD in top_view.keys(): # IF a value for that HD is already there, IGNORE | |
| continue | |
| else: | |
| top_view[node._HD] = node.show() | |
| for key in sorted(top_view): | |
| print(top_view[key]) | |
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