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switch day 7 to use longs
continuous-integration/drone/push Build is passing Details

This commit is contained in:
Ben Harris 2021-12-07 14:51:30 -05:00
parent c0a7534220
commit 9f1a502a61
1 changed files with 5 additions and 5 deletions
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10
aoc2021/Day07.cs
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@ -5,14 +5,14 @@
/// </summary>
public sealed class Day07 : Day
{
private readonly List<int> _tape;
private readonly List<long> _tape;
public Day07() : base(7, "The Treachery of Whales")
{
_tape = Input.First().Split(',').Select(int.Parse).OrderBy(i => i).ToList();
_tape = Input.First().Split(',').Select(long.Parse).OrderBy(i => i).ToList();
}
private static int ArithmeticSumTo(int n) => n * (n + 1) / 2;
private static long ArithmeticSumTo(long n) => n * (n + 1) / 2L;
public override string Part1()
{
@ -23,8 +23,8 @@ public sealed class Day07 : Day
public override string Part2()
{
var avg = (decimal)_tape.Sum() / _tape.Count;
var floor = _tape.Select(t => ArithmeticSumTo(Math.Abs(t - (int)Math.Floor(avg)))).Sum();
var ceil = _tape.Select(t => ArithmeticSumTo(Math.Abs(t - (int)Math.Ceiling(avg)))).Sum();
var floor = _tape.Select(t => ArithmeticSumTo(Math.Abs(t - (long)Math.Floor(avg)))).Sum();
var ceil = _tape.Select(t => ArithmeticSumTo(Math.Abs(t - (long)Math.Ceiling(avg)))).Sum();
return $"{Math.Min(floor, ceil)}";
}
}