func (cell *ValueCell) prettyString(k int) string {
s := ""
for e := 3*k + 1; e <= 3*k+3; e++ {
if cell.Val.Contains(bitset.Element(e)) {
s += fmt.Sprintf("%d", e)
} else {
s += " "
}
}
return s
}
func (b *block) checkAll() {
for _, c := range b.cells {
c.checked = bitset.EmptySet
}
for id, c := range b.cells {
for e := bitset.Element(1); e <= 9; e++ {
// read from input channel here
if c.possible.Minus(c.checked).Contains(e) {
if b.check(id, e) {
c.checked = c.checked.Add(e)
} else {
c.possible = c.possible.Remove(e)
// write to output channel here
}
}
}
}
}
func parseCell(s string) Cell {
if len(s) != 5 {
return nil
}
if s == " " {
return &ValueCell{Val: bitset.Interval(1, 9)}
}
if s[2] == '\\' {
if v, h := parseClue(s[:2]), parseClue(s[3:]); v == errClue || h == errClue {
return nil
} else {
return &ClueCell{VClue: v, HClue: h}
}
}
e, err := strconv.Atoi(s)
if err != nil || e < 1 || 9 < e {
return nil
}
return &ValueCell{Val: bitset.Set(bitset.Element(e))}
}