1 files changed, 38 insertions, 0 deletions
diff --git a/2024/04b/run.rb b/2024/04b/run.rb
new file mode 100755
index 0000000..5fa5f4e
--- /dev/null
+++ b/2024/04b/run.rb
@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+
+@letters = {} 
+data = File.read("data.txt")
+data = data.split("\n")
+data = data.map(&:chars)
+data.each_with_index do |row, y|
+  row.each_with_index do |letter, x|
+    @letters[[x,y]] = letter
+  end
+end
+
+found = 0
+
+potential_starts = @letters.select{|key, val| val == "A" } 
+potential_starts.each do |key, value| 
+  score = 0
+
+  if @letters[[key[0] - 1, key[1] - 1]] == "M" && @letters[[key[0] + 1, key[1] + 1]] == "S"
+    score = score + 1
+  end
+
+  if @letters[[key[0] - 1, key[1] - 1]] == "S" && @letters[[key[0] + 1, key[1] + 1]] == "M"
+    score = score + 1
+  end
+
+  if @letters[[key[0] + 1, key[1] - 1]] == "M" && @letters[[key[0] - 1, key[1] + 1]] == "S"
+    score = score + 1
+  end
+
+  if @letters[[key[0] + 1, key[1] - 1]] == "S" && @letters[[key[0] - 1, key[1] + 1]] == "M"
+    score = score + 1
+  end
+
+  found += 1 if score >= 2
+end
+
+p found