sudoku - unique.go

     1  package sudoku
     2  
     3  // Unique represents a section of data where each cell needs to be different
     4  type Unique []int
     5  
     6  // Constrain implements the Constraint interface
     7  func (u Unique) Constrain(s *Sudoku, pos int, marked []bool) bool {
     8  	if slicePos([]int(u), pos) == -1 {
     9  		return true
    10  	}
    11  	myMark := make([]int, 0, len(u))
    12  	for _, p := range u {
    13  		if mp := s.Pos(p); mp != 0 {
    14  			if slicePos(myMark, mp) != -1 {
    15  				return false
    16  			}
    17  			myMark = append(myMark, mp)
    18  			marked[mp] = true
    19  		}
    20  	}
    21  	return true
    22  }