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19 lines
375 B
Python
19 lines
375 B
Python
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class Set:
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def __init__(self):
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self.elts = {}
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def add(self, elt):
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self.elts[elt] = elt
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def items(self):
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return self.elts.keys()
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def has_elt(self, elt):
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return self.elts.has_key(elt)
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class Stack:
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def __init__(self):
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self.stack = []
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self.pop = self.stack.pop
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def push(self, elt):
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self.stack.append(elt)
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def top(self):
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return self.stack[-1]
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