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{ color: #546E7A } /* Generic.Output */ .highlight .gp { color: #FFCB6B } /* Generic.Prompt */ .highlight .gs { color: #FF5370 } /* Generic.Strong */ .highlight .gu { color: #89DDFF } /* Generic.Subheading */ .highlight .gt { color: #FF5370 } /* Generic.Traceback */ .highlight .kc { color: #89DDFF } /* Keyword.Constant */ .highlight .kd { color: #BB80B3 } /* Keyword.Declaration */ .highlight .kn { color: #89DDFF; font-style: italic } /* Keyword.Namespace */ .highlight .kp { color: #89DDFF } /* Keyword.Pseudo */ .highlight .kr { color: #BB80B3 } /* Keyword.Reserved */ .highlight .kt { color: #BB80B3 } /* Keyword.Type */ .highlight .ld { color: #C3E88D } /* Literal.Date */ .highlight .m { color: #F78C6C } /* Literal.Number */ .highlight .s { color: #C3E88D } /* Literal.String */ .highlight .na { color: #BB80B3 } /* Name.Attribute */ .highlight .nb { color: #82AAFF } /* Name.Builtin */ .highlight .nc { color: #FFCB6B } /* Name.Class */ .highlight .no { color: #EEFFFF } /* Name.Constant */ .highlight .nd { color: #82AAFF } /* Name.Decorator */ .highlight .ni { color: #89DDFF } /* Name.Entity */ .highlight .ne { color: #FFCB6B } /* Name.Exception */ .highlight .nf { color: #82AAFF } /* Name.Function */ .highlight .nl { color: #82AAFF } /* Name.Label */ .highlight .nn { color: #FFCB6B } /* Name.Namespace */ .highlight .nx { color: #EEFFFF } /* Name.Other */ .highlight .py { color: #FFCB6B } /* Name.Property */ .highlight .nt { color: #FF5370 } /* Name.Tag */ .highlight .nv { color: #89DDFF } /* Name.Variable */ .highlight .ow { color: #89DDFF; font-style: italic } /* Operator.Word */ .highlight .pm { color: #89DDFF } /* Punctuation.Marker */ .highlight .w { color: #EEFFFF } /* Text.Whitespace */ .highlight .mb { color: #F78C6C } /* Literal.Number.Bin */ .highlight .mf { color: #F78C6C } /* Literal.Number.Float */ .highlight .mh { color: #F78C6C } /* Literal.Number.Hex */ .highlight .mi { color: #F78C6C } /* Literal.Number.Integer */ .highlight .mo { color: #F78C6C } /* Literal.Number.Oct */ .highlight .sa { color: #BB80B3 } /* Literal.String.Affix */ .highlight .sb { color: #C3E88D } /* Literal.String.Backtick */ .highlight .sc { color: #C3E88D } /* Literal.String.Char */ .highlight .dl { color: #EEFFFF } /* Literal.String.Delimiter */ .highlight .sd { color: #546E7A; font-style: italic } /* Literal.String.Doc */ .highlight .s2 { color: #C3E88D } /* Literal.String.Double */ .highlight .se { color: #EEFFFF } /* Literal.String.Escape */ .highlight .sh { color: #C3E88D } /* Literal.String.Heredoc */ .highlight .si { color: #89DDFF } /* Literal.String.Interpol */ .highlight .sx { color: #C3E88D } /* Literal.String.Other */ .highlight .sr { color: #89DDFF } /* Literal.String.Regex */ .highlight .s1 { color: #C3E88D } /* Literal.String.Single */ .highlight .ss { color: #89DDFF } /* Literal.String.Symbol */ .highlight .bp { color: #89DDFF } /* Name.Builtin.Pseudo */ .highlight .fm { color: #82AAFF } /* Name.Function.Magic */ .highlight .vc { color: #89DDFF } /* Name.Variable.Class */ .highlight .vg { color: #89DDFF } /* Name.Variable.Global */ .highlight .vi { color: #89DDFF } /* Name.Variable.Instance */ .highlight .vm { color: #82AAFF } /* Name.Variable.Magic */ .highlight .il { color: #F78C6C } /* Literal.Number.Integer.Long */

(defun solver (marker-size)
  (with-open-file (in "input" :element-type 'unsigned-byte)
    (loop with acc = (make-array marker-size :element-type 'unsigned-byte)
          for char = (ash 1 (- (read-byte in) 96)) ;; all lowercase letters thus subtract ascii start
          and idx from 1
          do (setf (aref acc (mod idx marker-size)) char)
          when (<= marker-size (logcount (reduce (lambda (set v) (logxor set v)) acc)))
            return idx)))

(ql:quickload :fiveam)

(fiveam:test results
             (fiveam:is (= 1655 (solver 4)))
             (fiveam:is (= 2665 (solver 14))))

(fiveam:run-all-tests)


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