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| \ utils
: skip-thru ( c -- ) begin in< over = until drop ;
: array ( n -- ) ( i -- addr )
here# swap cells allot does> swap cells + ;
: sum ( a u -- ) 0 >r for @+ to+ V1 next V1 rdrop ;
212 const num-cards
100 array winning-buf
num-cards 1+ array card-copies
: clear-winning 100 for 0 i winning-buf ! next ; \ semi wasteful (32-bit)
: a-points ( n -- n2 ) 1 swap lshift >> ; \ 2^(n-1)
0 value cur-card
: add-copies ( n -- ) cur-card card-copies @ >r
0 swap for2 cur-card i 1+ + dup num-cards > if break then
card-copies V1 1+ swap +! next rdrop to1+ cur-card ;
: check-wins ( n... -- n )
0 >r begin scnt 0 <> while
winning-buf @ if to1+ V1 then repeat V1 rdrop ;
0 value points
: Card check-wins dup a-points to+ points
add-copies clear-winning ':' skip-thru ;
: | scnt for winning-buf 1 swap ! next ;
f<< /aoc/input Card x:
points . nl> \ part 1
0 card-copies num-cards 1+ sum num-cards + . nl> \ part 2
|
