Fix bounds check

2023-12-10 13:43:33 +00:00
parent f28551bdf0
commit 13505a0cdf
1 changed files with 3 additions and 3 deletions
--- a/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day10.fs
+++ b/AdventOfCode2023.FSharp/AdventOfCode2023.FSharp.Lib/Day10.fs
@@ -88,7 +88,7 @@ module Day10 =
        let mutable pointB =
            let pos = ofRowAndCol lineLength (startLine - 1) startCol

-            match s.[pos] with
+            match if pos >= 0 then s.[pos] else 'n' with
            | '|'
            | '7'
            | 'F' -> pos
@@ -96,7 +96,7 @@ module Day10 =

            let pos = ofRowAndCol lineLength (startLine + 1) startCol

-            match s.[pos] with
+            match if pos < s.Length then s.[pos] else 'n' with
            | '|'
            | 'L'
            | 'J' -> pos
@@ -104,7 +104,7 @@ module Day10 =

            let pos = ofRowAndCol lineLength startLine (startCol + 1)

-            match s.[pos] with
+            match if pos < s.Length then s.[pos] else 'n' with
            | '-'
            | 'J'
            | '7' -> pos