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day 16 cleanup 

switch to globals (passing array names around is ugly).
(maybe look into dicts sometime?)

also, properly detect width/height from the input
instead of hardcoding it
main
magical 2023-12-17 06:24:26 +00:00
parent c592761d00
commit 539cf753d0
1 changed files with 70 additions and 51 deletions
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87
day16/sol.tcl
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@ -1,8 +1,10 @@
#!/usr/bin/env tclsh
source ../prelude.tcl
proc read-input {gridp input} {
upvar $gridp grid
proc read-input {input} {
global grid
global width
global height
set i 0
while {[gets $input line] >= 0} {
set j 0
@ -12,11 +14,17 @@ proc read-input {gridp input} {
}
incr i
}
set height $i
set width $j
}
proc mark-visited {visitp x y d} {
if {$x < 0} {return 0}
upvar $visitp visit
proc reset-visited {} {
global visit
array unset visit
}
proc mark-visited {x y d} {
global visit
set v [switch -exact -- $d n {expr 1} s {expr 2} w {expr 4} e {expr 8} default {error "invalid dir '$d'"}]
incr visit($y,$x) 0
set result [expr {($visit($y,$x) & $v) != 0}]
@ -24,13 +32,29 @@ proc mark-visited {visitp x y d} {
return $result
}
proc follow {gridp visitp beams {first 0}} {
upvar $gridp grid
upvar $visitp visit
proc print-visited {} {
global visit
global width
global height
for {set i 0} {$i < $height} {incr i} {
set row {}
for {set j 0} {$j < $width} {incr j} {
if {[info exist visit($i,$j)] && $visit($i,$j)} {
lappend row "#"
} else {
lappend row "."
}
}
puts [join $row ""]
}
}
proc follow {beams {first 0}} {
global grid
set newbeams {}
foreach {x y d} $beams {
if {!$first} {
if { [mark-visited visit $x $y $d] } continue
if { [mark-visited $x $y $d] } continue
switch $d {
n { incr y -1 }
s { incr y +1 }
@ -38,7 +62,7 @@ proc follow {gridp visitp beams {first 0}} {
e { incr x +1 }
}
}
if {![info exists grid($y,$x)]} continue
if {[info exists grid($y,$x)]} {
switch -exact "$grid($y,$x) $d" {
{\ n} { set d w }
{\ s} { set d e }
@ -57,29 +81,18 @@ proc follow {gridp visitp beams {first 0}} {
lappend newbeams $x $y ${d'}
}
}
}
return $newbeams
}
proc solve {} {
global grid
set beams [follow grid visit {0 0 e} 1]
global visit
reset-visited
set beams [follow {0 0 e} 1]
while {[llen $beams] > 0} {
set beams [follow grid visit $beams]
}
set t 0
set N 10
for {set i 0} {$i < $N} {incr i} {
set row {}
for {set j 0} {$j < $N} {incr j} {
if {[info exists visit($i,$j)] && $visit($i,$j)} {
lappend row "#"
incr t
} else {
lappend row "."
}
}
puts [join $row ""]
set beams [follow $beams]
}
print-visited
puts [array size visit]
}
@ -89,8 +102,13 @@ proc lmax {list} {
return $t
}
proc solve2 {width height} {
proc solve2 {} {
global grid
global width
global height
global visit
puts "width=$width height=$height"
set edges {}
foreach k [array names grid] {
lassign [split $k ","] y x
@ -102,10 +120,10 @@ proc solve2 {width height} {
set l {}
foreach beams $edges {
array unset visit
set beams [follow grid visit $beams 1]
reset-visited
set beams [follow $beams 1]
while {[llen $beams] > 0} {
set beams [follow grid visit $beams]
set beams [follow $beams]
}
puts [array size visit]
lappend l [array size visit]
@ -114,9 +132,10 @@ proc solve2 {width height} {
puts [lmax $l]
}
read-input grid stdin
read-input stdin
puts [array get grid]
puts [follow grid visit {0 0 e}]
puts [follow {0 0 e}]
puts [array get visit]
solve
solve2 110 110
solve2