- if len(in) != BOARD_SIZE {
- return nil, fmt.Errorf("Please provide %d values", BOARD_SIZE)
- }
- var b Board
- for i, s := range in {
- num, err := strconv.Atoi(s)
- b[i] = Space(num)
- if err != nil {
- return nil, err
- }
- }
- return &b, nil
+ if len(in) != BOARD_SIZE {
+ return nil, fmt.Errorf("Please provide %d values", BOARD_SIZE)
+ }
+ var b Board
+ for i, s := range in {
+ num, err := strconv.Atoi(s)
+ b[i] = Space(num)
+ if err != nil {
+ return nil, err
+ }
+ }
+ return &b, nil
+}
+
+func adjacent_spaces(s Space) []Space {
+ if s < 0 || s >= BOARD_SIZE {
+ panic("Invalid space")
+ }
+ var adjacent []Space
+ if s >= BOARD_DIM {
+ adjacent = append(adjacent, s+UP)
+ }
+ if s < BOARD_SIZE-BOARD_DIM {
+ adjacent = append(adjacent, s+DOWN)
+ }
+ if s%BOARD_DIM != 0 {
+ adjacent = append(adjacent, s+LEFT)
+ }
+ if s%BOARD_DIM != BOARD_DIM-1 {
+ adjacent = append(adjacent, s+RIGHT)
+ }
+ return adjacent