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deque.py
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deque.py
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class SizeError(Exception):
pass
class Deque():
def __init__(self, max_size):
self.queue = [None] * max_size
self.max_n = max_size
self.head = 0
self.tail = -1
self.size = 0
@property
def is_full(self):
return self.size == self.max_n
@property
def is_empty(self):
return self.size == 0
def push_back(self, value):
if self.is_full:
raise SizeError
self.tail = (self.tail + 1) % self.max_n
self.queue[self.tail] = value
self.size += 1
def push_front(self, value):
if self.is_full:
raise SizeError
self.head = (self.head - 1) % self.max_n
self.queue[self.head] = value
self.size += 1
def pop_front(self):
if self.is_empty:
raise SizeError
value = self.queue[self.head]
self.head = (self.head + 1) % self.max_n
self.size -= 1
return value
def pop_back(self):
if self.is_empty:
raise SizeError
value = self.queue[self.tail]
self.tail = (self.tail - 1) % self.max_n
self.size -= 1
return value
def main():
n = int(input())
queue_length = int(input())
s = Deque(queue_length)
for i in range(n):
command, *values = input().split()
op = getattr(s, command)
values = tuple(map(int, values))
try:
result = op(*values)
except SizeError:
result = 'error'
if result is not None:
print(result)
if __name__ == '__main__':
main()