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| Day 20 of year 2021 | ||
| https://adventofcode.com/2021/day/20 | ||
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| == What I learned | ||
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| . How to do the equivalent of elif in a list comprehension. | ||
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| == Approach | ||
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| . I read in the enhancer and just leave it as a string. | ||
| . I put the trench values into a dictionary with the x,y coordinates in a tuple as the key | ||
| . Both Stars | ||
| .. I create a loop. | ||
| .. First, I add a frame of entries to my dictionary around the current grid of the current dictionary. | ||
| .. Since the parts outside of the grid could be "#" (the zero value in my enhancer was "#"), you have to be careful here. | ||
| .. Then you just find the values for all of the neighbors, join it to be a binary string and use the decimal conversion as an index into the enhancer string. | ||
| .. At the end, you just add up the lit squares. | ||
| .. It's not super efficient, but it still runs in a few seconds. | ||
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| == Run script | ||
| Run the solution with `python solution.py` | ||
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| [source, python] | ||
| .... | ||
| include::solution.py[] | ||
| .... |
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