game_solver *solver;
struct latin_solver *lsolver;
struct latin_solver_scratch *scratch;
- int ret, diff = DIFF_LATIN, extreme;
+ int ret, diff = DIFF_LATIN;
assert(maxdiff <= DIFF_RECURSIVE);
if (maxdiff <= DIFF_EASY)
break;
- ret = latin_solver_diff_set(lsolver, scratch, &extreme);
+ /* Row- and column-wise set elimination */
+ ret = latin_solver_diff_set(lsolver, scratch, 0);
if (ret < 0) {
diff = DIFF_IMPOSSIBLE;
goto got_result;
} else if (ret > 0) {
- diff = max(diff, extreme ? DIFF_EXTREME : DIFF_SET);
+ diff = max(diff, DIFF_SET);
goto cont;
}
if (maxdiff <= DIFF_SET)
break;
+ ret = latin_solver_diff_set(lsolver, scratch, 1);
+ if (ret < 0) {
+ diff = DIFF_IMPOSSIBLE;
+ goto got_result;
+ } else if (ret > 0) {
+ diff = max(diff, DIFF_EXTREME);
+ goto cont;
+ }
+
/*
* Forcing chains.
*/