added day 24

diff --git a/day24.onyx b/day24.onyx
new file mode 100644 (file)
index 0000000..cc86d31
--- /dev/null
+++ b/day24.onyx
@@ -0,0 +1,139 @@
+#include_file "core/std/wasi"
+
+use package core
+use package core.string.reader as reader
+
+Vec2 :: struct {
+       x: i32 = 0;
+       y: i32 = 0;
+}
+
+proc (v: Vec2) -> u32 #add_overload map.hash_function {
+       return v.x * 11 + v.y * 17;
+}
+
+proc (v1: Vec2, v2: Vec2) -> bool #add_overload map.cmp_function {
+       return v1.x == v2.x
+               && v1.y == v2.y;
+}
+
+Hex_Directions := Vec2.[
+       Vec2.{  1, 0 }, Vec2.{  1, -1 }, Vec2.{ 0, -1 }, 
+    Vec2.{ -1, 0 }, Vec2.{ -1,  1 }, Vec2.{ 0,  1 }, 
+];
+
+Cell :: struct {
+       alive : bool = false;
+       next  : bool = false;   
+}
+
+main :: proc (args: [] cstr) {
+       contents := file.get_contents("input/day24.txt");
+       defer string.free(contents);
+
+       file := reader.make(contents);
+
+       grid : map.Map(Vec2, Cell); // `true` is black
+       map.init(^grid, 1021);
+       defer map.free(^grid);
+
+       while !reader.empty(^file) {
+               line := reader.read_line(^file);        
+
+               loc := Vec2.{ 0, 0 };
+               s := 0;
+               for ch: line do switch s {
+                       case 0 do switch ch {
+                               case #char "e" do loc.x += 1;
+                               case #char "w" do loc.x -= 1;
+                               case #char "n" do s = 1;
+                               case #char "s" do s = 2;
+                       }
+
+                       case 1 {
+                               switch ch {
+                                       case #char "e" { loc.x += 1; loc.y -= 1; }
+                                       case #char "w" { loc.y -= 1; }
+                               }
+                               s = 0;
+                       }
+
+                       case 2 {
+                               switch ch {
+                                       case #char "e" { loc.y += 1; }
+                                       case #char "w" { loc.x -= 1; loc.y += 1; }
+                               }
+                               s = 0;
+                       }
+               }
+
+
+               curr := map.get(^grid, loc, Cell.{});   
+               map.put(^grid, loc, Cell.{ alive = !curr.alive });
+       }
+
+       // Part 1
+       black_count := 0;
+       for tile_entry: grid.entries {
+               if tile_entry.value.alive do black_count += 1;
+       }       
+       printf("Black count: %i\n", black_count);
+
+       // Part 2
+       cells_to_consider : [..] Vec2;
+       array.init(^cells_to_consider);
+       defer array.free(^cells_to_consider);
+
+       for i: 0 .. 100 {
+               for ^cell: grid.entries {
+                       if cell.value.alive {
+                               array.push(^cells_to_consider, cell.key);
+
+                               for ^dir: Hex_Directions {
+                                       array.push(^cells_to_consider, Vec2.{
+                                               x = cell.key.x + dir.x,
+                                               y = cell.key.y + dir.y,
+                                       });
+                               }
+                       }
+               }
+
+               for ^cell: cells_to_consider {
+                       state  := map.get(^grid, *cell, Cell.{});
+                       ncount := get_neighbor_count(^grid, *cell);
+
+                       if state.alive {
+                               state.next = ncount == 1 || ncount == 2;
+                       } else {
+                               state.next = ncount == 2;
+                       }
+
+                       map.put(^grid, *cell, state);
+               }
+
+               for ^cell: cells_to_consider {
+                       state := map.get(^grid, *cell, Cell.{});
+                       state.alive = state.next;
+                       map.put(^grid, *cell, state);   
+               }
+
+               array.clear(^cells_to_consider);
+       }
+
+       black_count = 0;
+       for tile_entry: grid.entries {
+               if tile_entry.value.alive do black_count += 1;
+       }       
+       printf("GOL black count: %i\n", black_count);
+}
+
+get_neighbor_count :: proc (grid: ^map.Map(Vec2, Cell), pos: Vec2) -> u32 {
+       count := 0;
+
+       for ^dir: Hex_Directions {
+               cell := map.get(grid, Vec2.{ x = pos.x + dir.x, y = pos.y + dir.y }, Cell.{});
+               if cell.alive do count += 1;
+       }
+
+       return count;
+}
\ No newline at end of file

diff --git a/input/day24.txt b/input/day24.txt
new file mode 100644 (file)
index 0000000..44a2f19
--- /dev/null
+++ b/input/day24.txt
@@ -0,0 +1,547 @@
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