Created
September 2, 2019 02:52
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| def convert(conversions, start, end): | |
| 'Given a conversion structure, performs a constant-time conversion' | |
| try: | |
| start_root, start_rate = conversions[start] | |
| end_root, end_rate = conversions[end] | |
| except KeyError: | |
| return None | |
| if start_root != end_root: | |
| return None | |
| return end_rate / start_rate |
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