unsigned char *row; /* o^2: row[y*cr+n-1] TRUE if n is in row y */
unsigned char *col; /* o^2: col[x*cr+n-1] TRUE if n is in col x */
+
+#ifdef STANDALONE_SOLVER
+ char **names; /* o: names[n-1] gives name of 'digit' n */
+#endif
};
#define cubepos(x,y,n) (((x)*solver->o+(y))*solver->o+(n)-1)
#define cube(x,y,n) (solver->cube[cubepos(x,y,n)])