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2 Commits
Author | SHA1 | Date |
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Ben Harris | a1f701ddf6 | |
Ben Harris | fcd1bfb5e5 |
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@ -1,4 +1,6 @@
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using System.IO;
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using System.Linq;
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using System.Linq;
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using System.Numerics;
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namespace aoc2020
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namespace aoc2020
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{
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{
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@ -9,7 +11,7 @@ namespace aoc2020
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public Day3()
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public Day3()
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{
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{
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_grid = Input.ToArray();
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_grid = File.ReadLines("input/day3big.in").ToArray();
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_width = _grid[0].Length;
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_width = _grid[0].Length;
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}
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}
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@ -32,18 +34,14 @@ namespace aoc2020
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public override string Part2()
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public override string Part2()
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{
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{
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var slopes = new[]
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var xSlops = new[] {2, 3, 4, 5, 8, 9, 12, 16, 18, 24, 32, 36, 48, 54, 65};
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{
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var ySlops = new[] {1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 25, 37, 41, 47};
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(1, 1),
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(3, 1),
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(5, 1),
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(7, 1),
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(1, 2)
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};
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return slopes
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return xSlops
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.SelectMany(x => ySlops, (x, y) => (x, y))
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.Select(s => CountSlope(s.Item1, s.Item2))
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.Select(s => CountSlope(s.Item1, s.Item2))
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.Aggregate((acc, i) => acc * i)
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.Select(s => new BigInteger(s))
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.Aggregate(BigInteger.Multiply)
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.ToString();
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.ToString();
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}
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}
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}
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}
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