2024 day 12 Complete!

helpers/coordinateByteMap.go

@@ -249,6 +249,22 @@ func (m *CoordByteMap) InsertColAfter(col int, fill byte) {
 	}
 }
 
+// FindAllUnique searches the whole map and returns a slice of all unique bytes
+func (m *CoordByteMap) FindAllUnique() []byte {
+	var ret []byte
+	track := make(map[byte]bool)
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			c := Coordinate{X: x, Y: y}
+			if !track[m.Get(c)] {
+				ret = append(ret, m.Get(c))
+				track[m.Get(c)] = true
+			}
+		}
+	}
+	return ret
+}
+
 // FindFirst searches left to right, top to bottom for the first
 // instance of b.
 func (m *CoordByteMap) FindFirst(b byte) (Coordinate, error) {