2021 Day 23 is complete, but not by code...

helpers/coordinateByteMap.go

@@ -1,6 +1,9 @@
 package aoc
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+)
 
 type CoordByteMap struct {
 	Field  map[Coordinate]byte
@@ -32,6 +35,56 @@ func StringSliceToCoordByteMap(input []string) CoordByteMap {
 	return ret
 }
 
+// FindFirst searches left to right, top to bottom for the first
+// instance of b.
+func (m *CoordByteMap) FindFirst(b byte) (Coordinate, error) {
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			c := Coordinate{X: x, Y: y}
+			if m.Get(c) == b {
+				return c, nil
+			}
+		}
+	}
+	return Coordinate{}, errors.New("Not Found")
+}
+
+func (m *CoordByteMap) FindAll(b ...byte) []Coordinate {
+	var ret []Coordinate
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			c := Coordinate{X: x, Y: y}
+			for i := range b {
+				if m.Get(c) == b[i] {
+					ret = append(ret, c)
+				}
+			}
+		}
+	}
+	return ret
+}
+
+func (m *CoordByteMap) FindAllNot(b ...byte) map[Coordinate]byte {
+	ret := make(map[Coordinate]byte)
+	for y := m.TLY; y <= m.BRY; y++ {
+		for x := m.TLX; x <= m.BRX; x++ {
+			c := Coordinate{X: x, Y: y}
+			v := m.Get(c)
+			var is bool
+			for i := range b {
+				if v == b[i] {
+					is = true
+					break
+				}
+			}
+			if !is {
+				ret[c] = v
+			}
+		}
+	}
+	return ret
+}
+
 func (m *CoordByteMap) Count(b byte) int {
 	var ret int
 	for y := m.TLY; y <= m.BRY; y++ {