1 files changed, 14 insertions, 0 deletions
diff --git a/prolog/problems/sorting/is_sorted_1/en.py b/prolog/problems/sorting/is_sorted_1/en.py
new file mode 100644
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+++ b/prolog/problems/sorting/is_sorted_1/en.py
@@ -0,0 +1,14 @@
+id = 121
+name = 'is_sorted/1'
+slug = 'check if list is sorted'
+
+description = '''\
+<p><code>is_sorted(L)</code>: the elements of list <code>L</code> are sorted in non-decreasing order.</p>
+<pre>
+  ?- is_sorted([2,3,6,8,12]).
+    true.
+  ?- is_sorted([2,3,1,6,5]).
+    false.
+</pre>'''
+
+hint = {}