adventofcode2023/day14/sol.tcl

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Tcl
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2023-12-14 09:00:36 +00:00
#!/usr/bin/env tclsh
source ../prelude.tcl
set input stdin
proc roll-left lane {
set prev {}
while {$prev ne $lane} {
set prev $lane
regsub -all {(\.+)(O+)} $lane {\2\1} lane
}
return $lane
}
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proc roll-right lane {
set prev {}
while {$prev ne $lane} {
set prev $lane
regsub -all {(O+)(\.+)} $lane {\2\1} lane
}
return $lane
}
proc cycle map {
set map [lmap l [transpose $map] {roll-left $l}] ;# North
set map [lmap l [transpose $map] {roll-left $l}] ;# West
set map [lmap l [transpose $map] {roll-right $l}] ;# South
set map [lmap l [transpose $map] {roll-right $l}] ;# East
return $map
}
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proc calc-load lane {
set N [slen $lane]
set load 0
for {set i 0} {$i < $N} {incr i} {
if {[string index $lane $i] eq "O"} {
incr load [expr {$N - $i}]
}
}
return $load
}
set map {}
while {[gets $input line] >= 0} {
lappend map $line
}
set part1 0
foreach l [transpose $map] {
set r [roll-left $l]
set n [calc-load $r]
puts "$l => $r | $n"
incr part1 $n
}
puts $part1
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puts [cycle $map]
puts [cycle [cycle $map]]
puts [cycle [cycle [cycle $map]]]
set start $map
set x 1
set warp 0
set goal 1000000000
for {set i 1} {$i <= $goal} {incr i} {
set map [cycle $map]
set ld [ladd [lmap l [transpose $map] {calc-load $l}]]
puts "$i ($ld) | $map"
#if {$i >= $x} {
#set x [expr {$x*10}]
#}
if {!$warp} {
if {[info exists seen($map)]} {
puts "$i == $seen($map)"
set warp [expr {$i - $seen($map)}]
incr i [expr {int(($goal - $i)/$warp)*$warp}]
puts "warping to $i"
}
set seen($map) $i
}
}
#puts "$goal\t| $map"
#puts [ladd [lmap l [transpose $map] {calc-load $l}]]