From 436956e015a62557c522e56265fb0351463cd419 Mon Sep 17 00:00:00 2001
From: Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si>
Date: Mon, 14 Mar 2016 18:29:12 +0100
Subject: Hints for permute/2 updated.

---
 prolog/problems/lists/permute_2/common.py | 6 +++++-
 prolog/problems/lists/permute_2/sl.py     | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

(limited to 'prolog/problems')

diff --git a/prolog/problems/lists/permute_2/common.py b/prolog/problems/lists/permute_2/common.py
index 55c2b48..cbd46d5 100644
--- a/prolog/problems/lists/permute_2/common.py
+++ b/prolog/problems/lists/permute_2/common.py
@@ -28,6 +28,7 @@ hint_type = {
     'predicate_always_false': Hint('predicate_always_false'),
     'base_case': Hint('base_case'),
     'recursive_case': Hint('recursive_case'),
+    'no_insert_or_delete': Hint('no_insert_or_delete'),
     'timeout': Hint('timeout'),
     'base_case_arbitrary': Hint('base_case_arbitrary'),
     'unsuccessful_conc_use': Hint('unsuccessful_conc_use'),
@@ -105,7 +106,10 @@ def hint(code, aux_code):
         # base cases work, 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, 'permute([qa,qb], [qb,qa])'):
-            return [{'id': 'recursive_case'}]
+            if prolog.util.Token('NAME', 'insert') in tokens or prolog.util.Token('NAME', 'del') in tokens:
+                return [{'id': 'recursive_case'}]
+            else:
+                return [{'id': 'no_insert_or_delete'}]
 
     except socket.timeout as ex:
         return [{'id': 'timeout'}]
diff --git a/prolog/problems/lists/permute_2/sl.py b/prolog/problems/lists/permute_2/sl.py
index 8472cab..5e347e4 100644
--- a/prolog/problems/lists/permute_2/sl.py
+++ b/prolog/problems/lists/permute_2/sl.py
@@ -67,6 +67,11 @@ narediti ti z rezultatom, ki ga rekurzija vrne. Skratka, element <code>H</code>
 
     'recursive_case': '''\
 <p>Robni primer deluje. Kaj pa rekurzivni, splošni, primer?</p>
+''',
+
+    'no_insert_or_delete': '''\
+<p>Robni primer deluje. Kaj pa rekurzivni, splošni, primer? Morda se ti splača uporabiti kakšno že rešeno
+nalogo s seznami?</p>
 ''',
 
     'predicate_always_false': '''\
-- 
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