Created
July 9, 2024 08:20
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import dataclasses | |
from typing import List | |
@dataclasses.dataclass | |
class AverageableQueue: | |
''' | |
A queue of numbers with a O(1) average() operation. | |
inv: self._total == sum(self._values) | |
''' | |
_values = [] | |
_total = 0 | |
def push(self, val: int): | |
self._values.append(val) | |
self._total += val | |
def pop(self) -> int: | |
''' pre: len(self._values) > 0 ''' | |
val = self._values.pop(0) | |
# Oops. We are forgetting to do something here. | |
return val | |
def average(self) -> float: | |
''' pre: self._values ''' | |
return self._total / len(self._values) |
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