day15: add python solution
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@ -19,5 +19,6 @@ https://adventofcode.com/2020/
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|11 | `**` | | |
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|13 | | `**` | |
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|14 | | `**` | |
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|15 | `**` | | |
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`test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.
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2
data/day15.expected
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2
data/day15.expected
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@ -0,0 +1,2 @@
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496
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883
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1
data/day15.input
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data/day15.input
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@ -0,0 +1 @@
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2,0,1,7,4,14,18
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27
day15/day15.py
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27
day15/day15.py
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@ -0,0 +1,27 @@
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#!/usr/bin/env python
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import sys
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def run_game(init, iterations):
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last_seen = {}
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previous = None
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for i, n in enumerate(init):
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if previous is not None:
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last_seen[previous] = i-1
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previous = n
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for i in range(i+1, iterations):
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if previous in last_seen:
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x = i - last_seen[previous] - 1
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else:
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x = 0
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last_seen[previous] = i-1
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previous = x
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return previous
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if __name__ == '__main__':
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init = [int(n) for n in sys.stdin.read().split(',')]
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print(run_game(init, 2020))
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print(run_game(init, 30000000))
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