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