ben
/
aoc2021
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

finish d8p2
continuous-integration/drone/push Build is failing Details

This commit is contained in:
Ben Harris 2021-12-08 11:32:37 -05:00
parent 1673962a72
commit d38a4e70c8
1 changed files with 25 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
aoc2021/Day08.cs
View File

@ -8,12 +8,11 @@ public sealed class Day08 : Day
private static readonly List<char[]> PossibleMappings = "abcdefg".ToCharArray().Permute().Select(m => m.ToArray()).ToList();
public Day08() : base(8, "Seven Segment Search")
{
UseTestInput = true;
}
private static int MatchDigit(char[] lit)
private static int MatchDigit(string lit)
{
return new string(lit) switch
return lit switch
{
"1110111" => 0,
"0010010" => 1,
@ -33,31 +32,47 @@ public sealed class Day08 : Day
{
var s = line.Split(" | ").Select(s => s.Split(' ')).ToList();
int i;
char[] lit;
for (i = 0; i < PossibleMappings.Count; i++)
{
var lit = "0000000".ToCharArray();
var matches = new int[10];
var matches = 0;
var failed = false;
foreach (var signal in s[0])
{
lit = "0000000".ToCharArray();
foreach (var c in signal)
lit[Array.IndexOf(PossibleMappings[i], c)] = '1';
var match = MatchDigit(lit);
var match = MatchDigit(new(lit));
if (match == -1)
{
failed = true;
break;
}
matches[match] = 1;
matches++;
}
if (failed) continue;
if (matches.All(m => m == 1)) break;
if (matches == 10) break;
}
var mapping = PossibleMappings[i];
return 1;
if (i == PossibleMappings.Count)
{
throw new("no mapping found");
}
var digits = new StringBuilder();
foreach (var o in s[1])
{
lit = "0000000".ToCharArray();
foreach (var c in o)
lit[Array.IndexOf(PossibleMappings[i], c)] = '1';
digits.Append(MatchDigit(new(lit)));
}
return int.Parse(digits.ToString());
}
public override string Part1() =>