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day two part two

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boxfriend
2025-12-02 10:39:54 -05:00
parent 8dbf5946ee
commit 1ac8cee3d5
1 changed files with 11 additions and 4 deletions
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13
AdventOfCode2025/GiftShop.cs
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@@ -4,22 +4,27 @@ namespace AdventOfCode2025;
public class GiftShop : IAdventSolution public class GiftShop : IAdventSolution
{ {
private readonly Regex _regex = new(@"^(.+)\1+$");
public AdventSolution Solve(string input) public AdventSolution Solve(string input)
{ {
var ranges = input.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries); var ranges = input.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
ulong totalInvalid = 0; ulong totalInvalid = 0;
ulong newInvalid = 0;
foreach (var rangeString in ranges) foreach (var rangeString in ranges)
{ {
var range = GetRange(rangeString); var range = GetRange(rangeString);
for (var i = range.Min; i <= range.Max; i++) for (var i = range.Min; i <= range.Max; i++)
{ {
if(IsInvalid(i)) if (IsInvalid(i))
totalInvalid += (ulong)i; totalInvalid += i;
if(IsRepeat(i))
newInvalid += i;
} }
} }
return new AdventSolution(totalInvalid.ToString(), null); return new AdventSolution(totalInvalid.ToString(),newInvalid.ToString());
} }
private bool IsInvalid(ulong id) private bool IsInvalid(ulong id)
@@ -31,6 +36,8 @@ public class GiftShop : IAdventSolution
return first == second; return first == second;
} }
private bool IsRepeat(ulong id) => _regex.IsMatch(id.ToString());
private Range GetRange(string input) private Range GetRange(string input)
{ {
var numbers = input.Split('-', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries); var numbers = input.Split('-', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);