2025-01

2025/.tool-versions

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+ruby 3.4.7

2025/01.rb

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+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

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+# 2025
+
+Ruby 3.4.7