3 files changed, 70 insertions, 0 deletions
diff --git a/prolog/problems/world_data/people_in_capitals_1/common.py b/prolog/problems/world_data/people_in_capitals_1/common.py
new file mode 100644
index 0000000..b38a96f
--- /dev/null
+++ b/prolog/problems/world_data/people_in_capitals_1/common.py
@@ -0,0 +1,48 @@
+from operator import itemgetter
+import socket
+import prolog.engine
+import prolog.util
+from server.hints import Hint
+import server.problems
+
+id = 10003
+number = 30
+visible = True
+facts = 'mondial'
+
+solution = '''\
+people_in_capitals(N) :-
+    findall(Pop,
+        (country(_,_,Capital,_,_,_),
+         city(Capital,_,_,Pop,_,_,_),
+         number(Pop)), L),
+    sum(L, N).
+'''
+
+hint_type = {
+}
+
+test_cases = [
+    ('people_in_capitals(N)', [{'N': '316277426'}]),
+]
+
+def test(code, aux_code):
+    n_correct = 0
+    engine_id = None
+    try:
+        engine_id, output = prolog.engine.create(code=code+aux_code, timeout=5.0)
+        if engine_id is not None and 'error' not in map(itemgetter(0), output):
+            # Engine successfully created, and no syntax error in program.
+            for query, answers in test_cases:
+                if prolog.engine.check_answers(engine_id, query=query, answers=answers, timeout=1.0, inference_limit=None):
+                    n_correct += 1
+    except socket.timeout:
+        pass
+    finally:
+        if engine_id:
+            prolog.engine.destroy(engine_id)
+
+    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
+    if n_correct == len(test_cases):
+        hints += [{'id': 'final_hint'}]
+    return n_correct, len(test_cases), hints
diff --git a/prolog/problems/world_data/people_in_capitals_1/en.py b/prolog/problems/world_data/people_in_capitals_1/en.py
new file mode 100644
index 0000000..1c8b93d
--- /dev/null
+++ b/prolog/problems/world_data/people_in_capitals_1/en.py
@@ -0,0 +1,11 @@
+name = 'people_in_capitals/1'
+slug = 'number of people living in capitals'
+
+description = '''\
+<p><code>people_in_capitals(N)</code>: <code>N</code> is the total number of people living in capital cities of the world.</p>
+<p>Useful predicates:</p>
+<li><code>country(Name, ID, Capital, CapitalProvince, Size, Population)</code></li>
+<li><code>city(Name, Country ID, Province, Population, Lat, Lon, Elevation)</code>.</li>
+'''
+
+hint = {}
diff --git a/prolog/problems/world_data/people_in_capitals_1/sl.py b/prolog/problems/world_data/people_in_capitals_1/sl.py
new file mode 100644
index 0000000..a72ba5e
--- /dev/null
+++ b/prolog/problems/world_data/people_in_capitals_1/sl.py
@@ -0,0 +1,11 @@
+name = 'people_in_capitals/1'
+slug = 'število prebivalcev glavnih mest'
+
+description = '''\
+<p><code>people_in_capitals(N)</code>: <code>N</code> je število ljudi, ki živijo v glavnih mestih po svetu.</p>
+<p>Uporabni predikati:</p>
+<li><code>country(Name, ID, Capital, CapitalProvince, Size, Population)</code></li>
+<li><code>city(Name, Country ID, Province, Population, Lat, Lon, Elevation)</code>.</li>
+'''
+
+hint = {}