2025-01

2025/.tool-versions

@@ -0,0 +1 @@
+ruby 3.4.7

2025/01.rb

@@ -0,0 +1,25 @@
+input = File.readlines('input/01')
+pos = 50
+p1 = 0
+p2 = 0
+
+input.each do |line|
+  dir = line[0]
+  n = line[1..].to_i
+  (1..n).each do
+    if dir == 'R'
+      pos = (pos - 1 + 100) % 100
+    else
+      pos = (pos + 1) % 100
+    end
+    if pos.zero?
+      p2 += 1
+    end
+  end
+  if pos.zero?
+    p1 += 1
+  end
+end
+
+puts p1
+puts p2

2025/README.md

@@ -0,0 +1,3 @@
+# 2025
+
+Ruby 3.4.7

README.md

@@ -22,4 +22,4 @@ Advent Of Code solutions using a different language each year
 
 2024: Odin
 
-2025: TBD
+2025: Ruby