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(defstruct spec ()
x0 x1
y0 y1)
(defun read-input (: (name "input"))
(flow name
file-get-string
(match `target area: x=@x0..@x1, y=@y0..@y1\n@nil` @1
(new spec x0 (toint x0) x1 (toint x1) y0 (toint y0) y1 (toint y1)))))
(defun simulate-shot (sp xv yv)
(let ((x0 sp.x0) (x1 sp.x1)
(y0 sp.y0) (y1 sp.y1))
(for ((x 0) (y 0) (maxy -1000)) () ()
(cond
((or (< y y0) (> x x1))
(return))
((and (<= x0 x x1) (<= y0 y y1))
(return maxy)))
(inc x xv)
(inc y yv)
(upd maxy (max y maxy))
(dec xv (signum xv))
(dec yv 1))))
(defun solve-one (: (name :))
(let ((sp (read-input name)))
(flow
(build
(each-prod ((xv 1..40)
(yv 1..700))
(iflet ((maxy (simulate-shot sp xv yv)))
(add (list xv yv maxy)))))
(find-max @1 : caddr))))
(defun solve-two (: (name :))
(let ((sp (read-input name)))
(flow
(build
(each-prod ((xv 1..300)
(yv -100..400))
(iflet ((maxy (simulate-shot sp xv yv)))
(add (list xv yv maxy)))))
(mapcar (ap list @1 @2))
uniq
len)))
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