diff options
Diffstat (limited to 'prolog/problems/family_relations/sister_2')
| -rw-r--r-- | prolog/problems/family_relations/sister_2/common.py | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/prolog/problems/family_relations/sister_2/common.py b/prolog/problems/family_relations/sister_2/common.py index 1234985..2be3ab3 100644 --- a/prolog/problems/family_relations/sister_2/common.py +++ b/prolog/problems/family_relations/sister_2/common.py @@ -91,6 +91,10 @@ def hint(code, aux_code): try: engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0) + # target predicate seems to always be false + if not prolog.engine.ask_truth(engine_id, 'sister(_, _)'): + return [{'id': 'predicate_always_false'}] + # X must be female if prolog.engine.ask_truth(engine_id, 'male(X), sister(X, _)'): return [{'id': 'x_must_be_female'}] @@ -112,10 +116,6 @@ def hint(code, aux_code): if prolog.util.Token('NEQU', '\=') in tokens or prolog.util.Token('NEQA', '=\=') in tokens: return [{'id': 'neq+_instead_of_neq'}] - # target predicate seems to always be false - if prolog.engine.ask_one(engine_id, 'sister(_, _)') == 'false': - return [{'id': 'predicate_always_false'}] - # X and Y must be different # this is the last code-specific hint (when everything else doesn't trigger anymore) if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id, |