//public methods
public BitArray SolveNonogram(int[][] rows, int[][] cols)
{
var length = rows.Length * cols.Length;
var solutions = CollectionExt.Booleans.Backtrack(
new NonogramState(new int[cols.Length], ArrayExt.Create(cols.Length, -1), 0, -1, new BitArray(length), 0),
(state, b, i) => state.AssignValue(rows, cols, b),
state => state.Position == length);
solutions.AppendConstraint(state => b => state.TestValue(rows, cols, b));
return(solutions.SelectResults(set => set.Table).First());
}