/in/foo.cc:17:6: error: too many decimal points in number
   17 |     (0...xs.size - 1).each do |i|
      |      ^~~~~~~~~~~
/in/foo.cc:43:8: error: too many decimal points in number
   43 |       (0...ys.size - 1).each do |i|
      |        ^~~~~~~~~~~
/in/foo.cc:1:1: error: 'def' does not name a type
    1 | def solve
      | ^~~