! Copyright (C) 2022 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel math sequences sets splitting ;
IN: 2022-aoc3

: score ( n -- n' )
    dup CHAR: a >= [
        CHAR: a - 1 +
    ] [
        CHAR: A - 1 + 26 +
    ] if ;

: process-line ( string -- n )
    dup length 2 /i cut
    intersect [ score ] map sum ;

: aoc3-1 ( string -- n )
    split-lines 0 [ process-line + ] reduce ;

: process-lines ( strings -- n )
    first3 intersect intersect [ score ] map sum ;
    
: aoc3-2 ( string -- n )
    split-lines 3 group 0 [ process-lines + ] reduce ;