WIP: implement part 1

src/days/day12.zig

@@ -111,13 +111,26 @@ pub fn run(allocator: std.mem.Allocator) !void {
         }
     }
 
-    for (presents.items, 0..) |present, i| {
-        std.debug.print("{d}:\n{f}\n\n", .{i, present});
-    }
+    var accumulator: usize = 0;
 
     for (regions.items) |region| {
-        std.debug.print("{f}\n", .{region});
+        var area_needed: usize = 0;
+        for (region.required_presents, 0..) |amount, i| {
+            area_needed += amount * presents.items[i].area();
+        }
+        if (area_needed < region.area()) {
+            std.debug.print("{f}\nfits\n", .{region});
+            accumulator += 1;
+        }
     }
+
+    var buffer: [8]u8 = undefined;
+    var stdout_writer = std.fs.File.stdout().writer(&buffer);
+    const stdout = &stdout_writer.interface;
+
+    try stdout.print("{d}\n", .{accumulator});
+
+    try stdout.flush();
 }
 
 const Present = struct {
@@ -147,6 +160,10 @@ const Present = struct {
         const index = (y * Width) + x;
         return self.shape.isSet(index);
     }
+
+    pub fn area(self: Self) usize {
+        return self.shape.count();
+    }
 };
 
 const Region = struct {
@@ -173,6 +190,10 @@ const Region = struct {
     pub fn createEmpty(self: Self, allocator: std.mem.Allocator) !EmptyRegion {
         return try .init(allocator, self.width, self.height);
     }
+
+    pub fn area(self: Self) usize {
+        return self.width * self.height;
+    }
 };
 
 const EmptyRegion = struct {