1 files changed, 69 insertions, 0 deletions
diff --git a/2024/tcl/08.tcl b/2024/tcl/08.tcl
new file mode 100755
index 0000000..e62ed69
--- /dev/null
+++ b/2024/tcl/08.tcl
@@ -0,0 +1,69 @@
+#!/bin/env tclsh
+
+source lib.tcl
+setup 8 grid
+
+puts {Part 1: Antinode count in map}
+
+set antinodes {}
+set resonant_antinodes {}
+set antennae {}
+
+for {set x 0} {$x < $input(w)} {incr x} {
+  for {set y 0} {$y < $input(h)} {incr y} {
+    set cell [lindex $input(grid) $y $x]
+    if {[regexp {[a-zA-Z0-9]} $cell]} {
+      if [dict exists $antennae $cell] {
+        foreach antenna [dict keys [dict get $antennae $cell]] {
+          lassign $antenna x2 y2
+          dict set resonant_antinodes [list $x $y] 1
+          dict set resonant_antinodes [list $x2 $y2] 1
+
+          set xoff [expr {$x - $x2}]
+          set yoff [expr {$y - $y2}]
+
+          set ax [expr {$x + $xoff}]
+          set ay [expr {$y + $yoff}]
+          if {$ax >= 0 && $ax < $input(w) && $ay >= 0 && $ay < $input(h)} {
+            dict set antinodes [list $ax $ay] 1
+
+            while {$ax >= 0 && $ax < $input(w) && $ay >= 0 && $ay < $input(h)} {
+              dict set resonant_antinodes [list $ax $ay] 1
+              set ax [expr {$ax + $xoff}]
+              set ay [expr {$ay + $yoff}]
+            }
+          }
+
+          set ax [expr {$x2 - $xoff}]
+          set ay [expr {$y2 - $yoff}]
+          if {$ax >= 0 && $ax < $input(w) && $ay >= 0 && $ay < $input(h)} {
+            dict set antinodes [list $ax $ay] 1
+
+            while {$ax >= 0 && $ax < $input(w) && $ay >= 0 && $ay < $input(h)} {
+              dict set resonant_antinodes [list $ax $ay] 1
+              set ax [expr {$ax - $xoff}]
+              set ay [expr {$ay - $yoff}]
+            }
+          }
+        }
+      }
+      dict set antennae $cell [list $x $y] 1
+    }
+  }
+}
+
+puts "Antinodes: [llength [dict keys $antinodes]]"
+
+puts ""
+puts {Part 2: Resonant antinode count in map}
+
+puts "Resonant Antinodes: [llength [dict keys $resonant_antinodes]]"
+
+#foreach ra [dict keys $resonant_antinodes] {
+#  lassign $ra x y
+#  lset input(debug) $y $x "#"
+#}
+
+#foreach line $input(debug) {
+#  puts [join $line ""]
+#}