From 0cb99edad42fb4e383599dd56dc8db12bf8d40cc Mon Sep 17 00:00:00 2001 From: Aleksander Sadikov Date: Thu, 10 Mar 2016 01:32:27 +0100 Subject: Hints for insert/3 added. --- prolog/problems/lists/insert_3/common.py | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) (limited to 'prolog/problems/lists/insert_3/common.py') diff --git a/prolog/problems/lists/insert_3/common.py b/prolog/problems/lists/insert_3/common.py index 5b049f7..3b56cf3 100644 --- a/prolog/problems/lists/insert_3/common.py +++ b/prolog/problems/lists/insert_3/common.py @@ -26,10 +26,11 @@ hint_type = { 'predicate_always_false': Hint('predicate_always_false'), 'base_case': Hint('base_case'), 'timeout': Hint('timeout'), - 'del_from_empty_list_success': Hint('del_from_empty_list_success'), 'lost_heads': Hint('lost_heads'), 'recursive_case': Hint('recursive_case'), 'leading_heads_all_x': Hint('leading_heads_all_x'), + 'ins_results_in_empty_list': Hint('ins_results_in_empty_list'), + 'ins_results_in_arbitrary_result': Hint('ins_results_in_arbitrary_result'), } test_cases = [ @@ -77,34 +78,35 @@ def hint(code, aux_code): # recursion is getting bigger and bigger - # deleting from empty list succeeds with an emtpy list result - if prolog.engine.ask_truthTO(engine_id, 'del(_, [], _)'): - return [{'id': 'del_from_empty_list_success'}] + # inserting an element succeeds with an emtpy list result + if prolog.engine.ask_truthTO(engine_id, 'insert(_, _, [])'): + return [{'id': 'ins_results_in_empty_list'}] + + # inserting an element succeeds with an arbitrary result + if prolog.engine.ask_truth(engine_id, 'insert(_, _, L), var(L)'): + return [{'id': 'ins_results_in_arbitrary_result'}] # missing/failed base case - if not prolog.engine.ask_one(engine_id, 'del(qQ, [qQ,qa,qb,qc], [qa,qb,qc])'): + if not prolog.engine.ask_one(engine_id, 'insert(qQ, [qa,qb,qc], [qQ,qa,qb,qc])'): return [{'id': 'base_case'}] # target predicate seems to always be false - if not prolog.engine.ask_truth(engine_id, 'del(_, [_,_,_,_,_,_], _)'): + if not prolog.engine.ask_truth(engine_id, 'insert(_, [_,_,_,_,_,_], _)'): return [{'id': 'predicate_always_false'}] # forgot to put list head(s) back in the list when deleting an element - if prolog.engine.ask_truth(engine_id, 'del(q, [a,b,c,d,q,x,y,z], [x,y,z])'): + if prolog.engine.ask_truth(engine_id, 'insert(q, [a,b,c,d,x,y,z], [q,x,y,z])'): return [{'id': 'lost_heads'}] # used [X|T] instead of more general [H|T] in recursive case if prolog.engine.ask_truth(engine_id, \ - 'findall(NL, del(q, [q,q,q,a,b,c], NL), [[q,q,a,b,c],[q,q,a,b,c],[q,q,a,b,c]]).') and \ - not prolog.engine.ask_truth(engine_id, 'del(q, [a,b,c,q,x,y,z], [a,b,c,x,y,z])'): + 'findall(NL, insert(q, [a,b,c], NL), [[q,a,b,c], [q,q,b,c], [q,q,q,c], [q,q,q,q]]).') and \ + not prolog.engine.ask_truth(engine_id, 'insert(q, [a,b,c,x,y,z], [a,b,c,q,x,y,z])'): return [{'id': 'leading_heads_all_x'}] - # L=[H|T] at the end of the rule; this can be detected with test cases and can be wrong (in some sense) - # TODO: implement it, and provide a good explanation (might be hard) - # base case works, the recursive doesn't (but it doesn't timeout) # this may be left as the last, most generic hint - if not prolog.engine.ask_truth(engine_id, 'del(qQ, [qa,qb,qQ,qc], [qa,qb,qc])'): + if not prolog.engine.ask_truth(engine_id, 'insert(qQ, [qa,qb,qc], [qa,qb,qQ,qc])'): return [{'id': 'recursive_case'}] -- cgit v1.2.1