[2024][ruby][7.1]

2024/ruby/day_07.rb

@@ -0,0 +1,25 @@
+input = DATA.readlines
+  .map {|line|
+    nums = line.scan(/\d+/).map(&:to_i)
+    [nums.shift, nums]
+  }
+
+pp input.filter_map {|val, vars|
+  vals = vars.inject {|n,x|
+    %i[ + * ].flat_map {|op|
+      Array(n).map { _1.send(op, x) }
+    }
+  }
+  vals.include?(val) && val
+}.sum
+
+__END__
+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20