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November 13, 2025 19:10
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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: List[int] | |
| _total: int | |
| 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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