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solution.py
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63 lines (50 loc) · 1.39 KB
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from should_dsl import should, should_not
class QueueNode:
def __init__(self, next_node = None, data = None):
self.next_node = next_node
self.data = data
class Queue:
def __init__(self):
self.front = None
self.back = None
def empty(self):
return self.front == None
def push_back(self, data):
if not self.front:
self.back = QueueNode(data = data)
self.front = self.back
else:
self.back.next_node = QueueNode(data = data)
self.back = self.back.next_node
def pop_front(self):
result = self.front.data
self.front = self.front.next_node
return result
def test_queue():
queue = Queue()
queue.empty() |should| equal_to(True)
queue.push_back(1)
queue.push_back(2)
queue.push_back(3)
queue.empty() |should| equal_to(False)
queue.pop_front() |should| equal_to(1)
queue.pop_front() |should| equal_to(2)
queue.pop_front() |should| equal_to(3)
queue.empty() |should| equal_to(True)
queue.push_back(4)
queue.empty() |should| equal_to(False)
queue.pop_front() |should| equal_to(4)
in_cnt = 0
out_cnt = 0
for i in xrange(1, 50):
for j in xrange(i):
queue.push_back(in_cnt)
in_cnt += 1
queue.pop_front() |should| equal_to(out_cnt)
out_cnt += 1
while not queue.empty():
queue.pop_front() |should| equal_to(out_cnt)
out_cnt += 1
if __name__ == '__main__':
test_queue()
print "Success!"