Solve day 25

day-25/code_chronicle.rb

@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+class CodeChronicle
+  include NewlineInput
+
+  def unique_locks
+    locks = []
+    keys = []
+
+    current_item = Array.new(5) { Array.new(7) }
+    y = 0
+    lines.each do |line|
+      if line.empty?
+        if current_item.all? { _1.first == 1 }
+          locks << current_item
+        else
+          keys << current_item
+        end
+
+        current_item = Array.new(5) { Array.new(7) }
+        y = 0
+        next
+      end
+
+      line.each_char.with_index do |char, x|
+        current_item[x][y] = char == "#" ? 1 : 0
+      end
+
+      y += 1
+    end
+
+    if current_item.all? { _1.first == 1 }
+      locks << current_item
+    else
+      keys << current_item
+    end
+
+    locks = locks.map { _1.map(&:sum) }
+    keys = keys.map { _1.map(&:sum) }
+
+    result = 0
+    keys.each do |key|
+      locks.each do |lock|
+        result += 1 if key.zip(lock).map(&:sum).all? { _1 <= 7 }
+      end
+    end
+
+    result
+  end
+end