1 files changed, 118 insertions, 0 deletions
diff --git a/python/problems/while_and_if/minimax/common.py b/python/problems/while_and_if/minimax/common.py
new file mode 100644
index 0000000..6155024
--- /dev/null
+++ b/python/problems/while_and_if/minimax/common.py
@@ -0,0 +1,118 @@
+# coding=utf-8
+
+from python.util import has_token_sequence, string_almost_equal, \
+    string_contains_number, get_tokens, get_numbers, get_exception_desc
+from server.hints import Hint, HintSequence
+
+id = 199
+group = 'while_and_if'
+number = 4
+visible = True
+
+solution = '''\
+cena = 1
+vsota, eltov = 0, 0
+min_cena, max_cena = 100, 0
+while cena != 0:
+    cena = int(input("Cena: "))
+    vsota += cena
+    eltov += 1
+    if cena < min_cena and cena > 0:
+        min_cena = cena
+    if cena > max_cena:
+        max_cena = cena
+
+if eltov > 1:
+    pov = vsota / (eltov - 1)
+print (vsota, pov, min_cena, max_cena)
+'''
+
+hint_type = {
+    'printing': Hint('printing'),
+    'while_clause': Hint('while_clause'),
+    'nonumber': Hint('nonumber'),
+    'while_condition': Hint('while_condition'),
+    'average': Hint('while_condition'),
+}
+
+def test(python, code):
+    # List of inputs: (expression to eval, stdin).
+    test_in = [
+        (None, '2\n4\n1\n0\n'),
+        (None, '1\n1\n1\n1\n1\n0\n'),
+        (None, '1\n2\n0\n'),
+        (None, '5\n4\n3\n11\n7\n0\n'),
+        (None, '0\n'),
+    ]
+
+    test_out = [
+        (7, 2.333, 1, 4),
+        (5, 1, 1, 1),
+        (3, 1.5, 1, 2),
+        (30, 6, 3, 11),
+        (0, 0, 0, 0),
+    ]
+
+    # List of outputs: (expression result, stdout, stderr, exception).
+    answers = python(code=code, inputs=test_in, timeout=1.0)
+    outputs = [ans[1] for ans in answers]
+
+    n_correct = 0
+    tin = None
+    for i, (output, correct) in enumerate(zip(outputs, test_out)):
+        if all(string_almost_equal(output, correct[i]) for i in range(4)):
+            n_correct += 1
+        else:
+            tin = test_in[i][1]
+            tout = correct
+
+    passed = n_correct == len(test_in)
+    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
+    if tin:
+        hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin),
+                                                              'sum': str(tout[0]),
+                                                              'avg': str(tout[1]),
+                                                              'min': str(tout[2]),
+                                                              'max': str(tout[3])}})
+    return passed, hints
+
+def hint(python, code):
+    tokens = get_tokens(code)
+
+    # run one test first to see if there are any exceptions
+    test_in = [(None, '1\n1\n1\n1\n1\n0\n')]
+    answer = python(code=code, inputs=test_in, timeout=1.0)
+    exc = get_exception_desc(answer[0][3])
+    if exc:
+        if 'NameError' in answer[0][3]:
+            return [{'id':'name_error', 'args': {'message': answer[0][3]}}]
+        else:
+            return exc
+
+    # student does not have while or for: instruct him on loops
+    if not has_token_sequence(tokens, ['while']) and \
+       not has_token_sequence(tokens, ['for']):
+        return [{'id' : 'while_clause'}]
+
+    # student is not using division, therefore computing no average
+    if not has_token_sequence(tokens, ['/']):
+        return [{'id' : 'average'}]
+
+    # student is not computing max and min values.
+    if not has_token_sequence(tokens, ['<']) and \
+       not has_token_sequence(tokens, ['>']):
+        return [{'id' : 'minimax'}]
+
+    # student is not using print function
+    if not has_token_sequence(tokens, ['print']):
+        return [{'id' : 'printing'}]
+
+    # student does not print any values
+    if not get_numbers(answer[0][1]):
+        return [{'id' : 'nonumber'}]
+
+    # student's answer is not correct
+    if not string_almost_equal(answer[0][1], 5):
+        return [{'id' : 'while_condition'}]
+
+    return None