adventofcode2022/day08/sol.ivy

) get "input.ivy"

sample = 5 5 rho 3 0 3 7 3 2 5 5 1 2 6 5 3 3 2 3 3 5 4 9 3 5 3 9 0

op visible r =
    r = -1, r
    r = transp max\ transp r
    r = r > -1 flip r
    1 drop r

op vis2 m = (visible m) or (flip visible flip m)
op vis4 m = (vis2 m) or (transp vis2 transp m)

sample
+/, vis4 sample
+/, vis4 input



op pady a = -1, a, -1
op padx a = transp pady transp a
op pad a = pady padx a

A = pad sample


i = 3 3
d = 1 0

op i slice d =
    t = A[i[1];i[2]]
    t < 0: 0 rho 0
    t, (i+d) slice d

A
A[3;3]
i slice d
i slice -d

op empty v = 0 == rho v

# takes from v while v[i] is less than x
op x shorter v =
    empty v: v
    (and\ x > v) sel v

# returns 1 if any v[i] blocks x
op x blocked v =
    empty v: 0
    or/ x <= v

v = 1 2 3 4 3 2 5 6 1 2 3

5 shorter v
0 shorter 1 2 3

# takes from v while v[i] is less than v[0]
op shorter2 v =
    x = v[1]
    v = 1 flip v
    v, +/ (and\ transp x > v)

#shorter2 transp (1, rho v) rho v
#shorter2 3 3 rho flip iota 9

""
sample
"-"

op x viewDistance v = (x blocked v) + rho x shorter v
op viewDistance v = v[1] viewDistance 1 drop v

viewDistance 1 2 3
viewDistance 5 1 2 3
viewDistance 5 5

op p score A =
    x = p[1]
    y = p[2]
    e = A[y;x]
    row = A[y]
    col = A[;x]
    n = 1
    n = n * e viewDistance flip (x-1) take row
    n = n * e viewDistance x drop row
    n = n * e viewDistance flip (y-1) take col
    n = n * e viewDistance y drop col
    n

op i loopY A =
    i[2] > (rho A)[2]: 0
    (i score A) max (i + 0 1) loopY A

op i loopX A =
    i[1] > (rho A)[1]: 0
    (i loopY A) max (i + 1 0) loopX A

op solve A = 1 1 loopX A


1 1 score sample
2 2 score sample
3 4 score sample
solve sample

1 1 score sample; 1 2 score sample; 1 3 score sample; 1 4 score sample; 1 5 score sample
2 1 score sample; 2 2 score sample; 2 3 score sample; 2 4 score sample; 2 5 score sample
solve input