Hints for conc/3 added. And some misc bits here & there.

1 files changed, 12 insertions, 2 deletions

diff --git a/prolog/problems/lists/conc_3/common.py b/prolog/problems/lists/conc_3/common.py
index ce81bbe..3ed35bc 100644
--- a/prolog/problems/lists/conc_3/common.py
+++ b/prolog/problems/lists/conc_3/common.py
@@ -25,6 +25,7 @@ hint_type = {
     'base_case': Hint('base_case'),
     'timeout': Hint('timeout'),
     'final_hint': Hint('final_hint'),
+    'second_list_iteration': Hint('second_list_iteration'),
 }
 
 test_cases = [
@@ -76,12 +77,21 @@ def hint(code, aux_code):
         # recursion is getting bigger and bigger
 
 
+#        # missing/failed base case
+#        if not prolog.engine.ask_truthTO(engine_id, 'conc([], [qa,qb,qc], [qa,qb,qc])'):
+#            return [{'id': 'base_case'}]
+
+        # shortening the second list instead of first list
+        if prolog.engine.ask_truthTO(engine_id,
+           'conc([a,b,c], [1,2,3,4], L), (L = [1,2,3,4,a,b,c] ; L = [4,3,2,1,a,b,c])'):
+            return [{'id': 'second_list_iteration'}]
+
         # missing/failed base case
-        if not prolog.engine.ask_truthTO(engine_id, 'memb(qq, [qq,_,_,_])'):
+        if not prolog.engine.ask_one(engine_id, 'conc([], [qa,qb,qc], [qa,qb,qc])'):
             return [{'id': 'base_case'}]
 
         # target predicate seems to always be false
-        if not prolog.engine.ask_truth(engine_id, 'memb(_, [_,_,_,_,_,_])'):
+        if not prolog.engine.ask_truth(engine_id, 'conc([_,_,_,_,_,_], [_,_,_], _)'):
             return [{'id': 'predicate_always_false'}]
 
     except socket.timeout as ex: