From 9165dd7d8640d289aa8aba5f1ddb8b7c24a0eb1f Mon Sep 17 00:00:00 2001
From: Andrew Ekstedt <andrew.ekstedt@gmail.com>
Date: Wed, 20 Dec 2023 06:02:43 +0000
Subject: [PATCH] day 20 part 1

---
 day20/input      |  58 ++++++++++++++++++++++++
 day20/sample1.in |   5 ++
 day20/sample3.in |   5 ++
 day20/sol.tcl    | 116 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 184 insertions(+)
 create mode 100644 day20/input
 create mode 100644 day20/sample1.in
 create mode 100644 day20/sample3.in
 create mode 100755 day20/sol.tcl

diff --git a/day20/input b/day20/input
new file mode 100644
index 0000000..9c7cd49
--- /dev/null
+++ b/day20/input
@@ -0,0 +1,58 @@
+%jx -> rt, rs
+&cc -> cd, fc, qr, nl, gk, zr
+%qs -> cl, rs
+%zr -> cq
+%mx -> nr, pm
+%mj -> qr, cc
+%cj -> cc, nt
+%jv -> sp
+%dj -> bd, zc
+%kt -> lt
+broadcaster -> gz, xg, cd, sg
+&dn -> rx
+%br -> nf, bd
+%cd -> cc, nl
+%zc -> jq, bd
+%xg -> cf, pm
+%nz -> gm, bd
+&dd -> dn
+%nb -> sl
+&pm -> kt, xg, xp, jv, sp
+&fh -> dn
+%rt -> qq
+%qq -> rs, hd
+%hd -> qs, rs
+&xp -> dn
+%pj -> cc, mj
+%gz -> bd, kb
+%zd -> jv, pm
+%cq -> cj, cc
+%qr -> gk
+%ng -> jk, bd
+%kb -> bd, sv
+%cl -> zx, rs
+%gj -> zd, pm
+%sl -> kx
+%sv -> br
+%nf -> bd, nz
+%zx -> rs
+%nt -> mn, cc
+%rh -> nb, rs
+%gk -> ln
+&bd -> gm, gz, fh, sv
+%jq -> ng, bd
+%sp -> pc
+%sg -> rs, rh
+%kx -> jx
+&fc -> dn
+%cf -> gj, pm
+%pc -> kt, pm
+%jk -> bd
+%vf -> pm
+&rs -> sg, dd, sl, kx, nb, rt
+%nr -> vf, pm
+%ln -> zr, cc
+%lt -> pm, mx
+%gm -> dj
+%nl -> pj
+%mn -> cc
diff --git a/day20/sample1.in b/day20/sample1.in
new file mode 100644
index 0000000..3fc2bdb
--- /dev/null
+++ b/day20/sample1.in
@@ -0,0 +1,5 @@
+broadcaster -&gt; a, b, c
+%a -&gt; b
+%b -&gt; c
+%c -&gt; inv
+&amp;inv -&gt; a
diff --git a/day20/sample3.in b/day20/sample3.in
new file mode 100644
index 0000000..53a62ab
--- /dev/null
+++ b/day20/sample3.in
@@ -0,0 +1,5 @@
+broadcaster -> a
+%a -> inv, con
+&amp;inv -> b
+%b -> con
+&amp;con -> output
diff --git a/day20/sol.tcl b/day20/sol.tcl
new file mode 100755
index 0000000..012b8c9
--- /dev/null
+++ b/day20/sol.tcl
@@ -0,0 +1,116 @@
+#!/usr/bin/env tclsh
+source ../prelude.tcl
+
+proc read-input input {
+    global next
+    global type
+    global flip
+    global conj
+    while {[gets $input line] >= 0} {
+        # oops
+        set line [replace $line "&gt;" > "&amp;" &]
+        #puts $line
+        must_regexp {^([%&]?)([a-z]+) -> (.*)$} $line _ sigil name to
+        set next($name) [replace $to "," ""]
+        if {$sigil eq ""} {
+            set type($name) ""
+        } elseif {$sigil eq "%"} {
+            set type($name) "flip"
+            set flip($name) 0
+        } elseif {$sigil eq "&"} {
+            set type($name) "conj"
+            set conj($name) [dict create]
+        } else {
+            error "unknown sigil $sigil"
+        }
+    }
+    foreach n [array names type] {
+        foreach to $next($n) {
+            if {![info exists type($to)]} {
+                set type($to) ""
+            }
+            if {$type($to) eq "conj"} {
+                dict set conj($to) $n 0
+            }
+        }
+    }
+}
+
+
+proc pulse {init {debug 0}} {
+    global next
+    global type
+    global flip
+    global conj
+    global count
+
+    set n $init
+    set pulses {}
+
+    #puts [array get next]
+
+    incr count(0) ;# button
+    foreach to $next($init) {
+        #incr count(0)
+        lappend pulses $init $to 0
+    }
+
+    while {[llen $pulses]} {
+        if {$debug} {
+            puts "#[llen $pulses] : $pulses"
+        }
+        set copy $pulses
+        set pulses {}
+        foreach {from n value} $copy {
+            incr count($value)
+            switch $type($n) {
+                flip {
+                    if {$value == 0} {
+                        set flip($n) [expr {!$flip($n)}]
+                        foreach to $next($n) {
+                            lappend pulses $n $to $flip($n)
+                        }
+                    }
+                }
+                conj {
+                    dict set conj($n) $from $value
+                    set all 1
+                    foreach v [dict values $conj($n)] {
+                        if {!$v} {
+                            set all 0
+                            break
+                        }
+                    }
+                    set send [expr {!$all}]
+                    foreach to $next($n) {
+                        lappend pulses $n $to $send
+                    }
+                }
+            }
+        }
+    }
+    #puts $count(0)
+    #puts $count(1)
+}
+
+proc solve input {
+    read-input $input
+
+    global count
+    #puts [array get next]
+    #array set count {0 0 1 0}
+    set count(0) 0
+    set count(1) 0
+
+    global solved
+    set solved 0
+    for {set i 1} {$i <= 1000} {incr i} {
+        pulse broadcaster
+    }
+
+    puts "$count(0)"
+    puts $count(1)
+    puts [expr {$count(0) * $count(1)}]
+}
+
+solve stdin