diff options
Diffstat (limited to 'prolog/problems/family_relations/sister_2/common.py')
| -rw-r--r-- | prolog/problems/family_relations/sister_2/common.py | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/prolog/problems/family_relations/sister_2/common.py b/prolog/problems/family_relations/sister_2/common.py index 627648c..c112a9c 100644 --- a/prolog/problems/family_relations/sister_2/common.py +++ b/prolog/problems/family_relations/sister_2/common.py @@ -23,8 +23,9 @@ sister(X, Y) :- hint_type = { 'x_must_be_female': Hint('x_must_be_female'), 'common_parent_needed': Hint('common_parent_needed'), - 'y_can_be_of_any_gender': Hint('Y_can_be_of_any_gender'), + 'y_can_be_of_any_gender': Hint('y_can_be_of_any_gender'), 'x_y_must_be_different': Hint('x_y_must_be_different'), + 'neq_used_too_early': Hint('neq_used_too_early'), } test_cases = [ @@ -121,10 +122,17 @@ def hint(program, solved_problems): # X and Y must be different # this is the last code-specific hint (when everything else doesn't trigger anymore) - if prolog.engine.ask_truth(engine_id, + if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id, 'setof(X, (member(X, [sally, nevia, vanessa]), sister(X, X)), L), length(L, 3)'): return [{'id': 'x_y_must_be_different'}] + # X and Y must be different, but the user used '\==' + # most likely this means that \== was used before X and Y are known + # this is the last code-specific hint (when everything else doesn't trigger anymore) + if prolog.util.Token('NEQ', '\==') in tokens and prolog.engine.ask_truth(engine_id, + 'setof(X/Y, sister(X, Y), L), member(nevia/nevia, L), member(sally/sally, L), member(vanessa/vanessa, L)'): + return [{'id': 'neq_used_too_early'}] + # last hints are connected with programming style # here, this means detecting such code: # parent(P1, X), parent(P2, Y), P1 == P2 (or P1 = P2) |