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# coding=utf-8
from operator import itemgetter
import prolog.engine
import server.problems
id = 113
number = 20
visible = False
facts = None
solution = '''\
conc113([], L, L).
conc113([H|T], L2, [H|L]) :-
conc113(T, L2, L).
shiftleft([H|T], L2) :-
conc113(T, [H], L2).
'''
test_cases = [
('shiftleft([i], X)',
[{'X': '[i]'}]),
('shiftleft([h, e, u, l], X)',
[{'X': '[e, u, l, h]'}]),
('shiftleft([h, A, B, l, c], [x, y, C, D, E])',
[{'A': 'x', 'B': 'y', 'C': 'l', 'D': 'c', 'E': 'h'}]),
]
def test(code, aux_code):
n_correct = 0
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
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):
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)}}]
return n_correct, len(test_cases), hints
def hint(code, aux_code):
# TODO
return []
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