{ "run_id": 2, "model": "glm4-9b", "mode": "oneshot", "challenge": "word-ladder", "sample": 0, "status": "ok", "error": null, "score_total": 40.0, "score_tests": 0.0, "score_deliverables": 1.0, "score_content": 1.0, "tests_passed": 0, "tests_failed": 5, "wall_secs": 13.837303708001855, "slug": "run2-glm4-9b-oneshot-word-ladder-s0", "challenge_title": "Word ladder (shortest path)", "spec": "Create ladder.py with exactly one function:\n\nladder_length(begin: str, end: str, word_list: list[str]) -> int\n A transformation sequence goes from begin to end, changing exactly one letter per step; every intermediate word (and end itself) must appear in word_list. Return the number of words in the SHORTEST such sequence counting both endpoints, or 0 if none exists. begin does not need to be in word_list. All words are lowercase and the same length.\n\nExample: begin=\"hit\", end=\"cog\", word_list=[\"hot\",\"dot\",\"dog\",\"lot\",\"log\",\"cog\"] -> 5 (hit -> hot -> dot -> dog -> cog).\n\nUse only the Python standard library. A breadth-first search is the intended approach; brute-force recursion will be too slow for the larger test.", "expected_files": [ "ladder.py" ], "content_checks": { "ladder.py": [ "def ladder_length" ] }, "test_files": { "test_ladder.py": "import time\n\nfrom ladder import ladder_length\n\n\ndef test_classic_example():\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\", \"cog\"]) == 5\n\n\ndef test_unreachable_end():\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\"]) == 0\n\n\ndef test_single_step():\n assert ladder_length(\"a\", \"c\", [\"a\", \"b\", \"c\"]) == 2\n\n\ndef test_shortest_is_found():\n words = [\"hot\", \"hit\", \"hat\", \"cat\", \"cot\", \"cog\", \"dog\"]\n assert ladder_length(\"hit\", \"cot\", words) == 3\n\n\ndef test_larger_input_is_fast():\n words = [a + b + c for a in \"abcdefgh\" for b in \"abcdefgh\" for c in \"abcdefgh\"]\n start = time.monotonic()\n assert ladder_length(\"aaa\", \"hhh\", words) == 4\n assert time.monotonic() - start < 2.0\n" }, "events": [ { "ts": "2026-07-17T19:16:03.983386+00:00", "event": "start", "run": 2, "model": "glm4-9b", "mode": "oneshot", "challenge": "word-ladder", "sample": 0 }, { "ts": "2026-07-17T19:16:03.983427+00:00", "event": "prompt", "mode": "oneshot", "content": "You are completing a coding task in one shot. Write complete files that satisfy the spec below. Tests (pytest) will be run against your files; you cannot run them yourself.\n\nReply with ONE JSON object and nothing else:\n{\"files\": {\"\": \"\", ...}}\n\nRequired deliverable files: ladder.py\n\nSPEC:\nCreate ladder.py with exactly one function:\n\nladder_length(begin: str, end: str, word_list: list[str]) -> int\n A transformation sequence goes from begin to end, changing exactly one letter per step; every intermediate word (and end itself) must appear in word_list. Return the number of words in the SHORTEST such sequence counting both endpoints, or 0 if none exists. begin does not need to be in word_list. All words are lowercase and the same length.\n\nExample: begin=\"hit\", end=\"cog\", word_list=[\"hot\",\"dot\",\"dog\",\"lot\",\"log\",\"cog\"] -> 5 (hit -> hot -> dot -> dog -> cog).\n\nUse only the Python standard library. A breadth-first search is the intended approach; brute-force recursion will be too slow for the larger test.\n" }, { "ts": "2026-07-17T19:16:17.626486+00:00", "event": "completion", "content": "```json\n{\"files\": {\"ladder.py\": \"from collections import deque\\n\\ndef ladder_length(begin: str, end: str, word_list: list[str]) -> int:\\n if begin == end:\\n return 0\\n visited = set([begin])\\n queue = deque([(begin, 1)])\\n while queue:\\n current_word, steps = queue.popleft()\\n for i in range(len(current_word)):\\n for c in 'abcdefghijklmnopqrstuvwxyz':\\n new_word = current_word[:i] + c + current_word[i+1:]\\n if new_word == end:\\n return steps + 2\\n if new_word in word_list and new_word not in visited:\\n visited.add(new_word)\\n queue.append((new_word, steps + 1))\\n return 0\"}}", "tokens": 185 }, { "ts": "2026-07-17T19:16:17.627815+00:00", "event": "write_file", "path": "ladder.py", "bytes": 677 }, { "ts": "2026-07-17T19:16:17.820429+00:00", "event": "graded", "total": 40.0, "tests_passed": 0, "tests_failed": 5, "output": "FFFFF [100%]\n=================================== FAILURES ===================================\n_____________________________ test_classic_example _____________________________\ntest_ladder.py:7: in test_classic_example\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\", \"cog\"]) == 5\nE AssertionError: assert 6 == 5\nE + where 6 = ladder_length('hit', 'cog', ['hot', 'dot', 'dog', 'lot', 'log', 'cog'])\n_____________________________ test_unreachable_end _____________________________\ntest_ladder.py:11: in test_unreachable_end\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\"]) == 0\nE AssertionError: assert 6 == 0\nE + where 6 = ladder_length('hit', 'cog', ['hot', 'dot', 'dog', 'lot', 'log'])\n_______________________________ test_single_step _______________________________\ntest_ladder.py:15: in test_single_step\n assert ladder_length(\"a\", \"c\", [\"a\", \"b\", \"c\"]) == 2\nE AssertionError: assert 3 == 2\nE + where 3 = ladder_length('a', 'c', ['a', 'b', 'c'])\n____________________________ test_shortest_is_found ____________________________\ntest_ladder.py:20: in test_shortest_is_found\n assert ladder_length(\"hit\", \"cot\", words) == 3\nE AssertionError: assert 4 == 3\nE + where 4 = ladder_length('hit', 'cot', ['hot', 'hit', 'hat', 'cat', 'cot', 'cog', ...])\n__________________________ test_larger_input_is_fast ___________________________\ntest_ladder.py:26: in test_larger_input_is_fast\n assert ladder_length(\"aaa\", \"hhh\", words) == 4\nE AssertionError: assert 5 == 4\nE + where 5 = ladder_length('aaa', 'hhh', ['aaa', 'aab', 'aac', 'aad', 'aae', 'aaf', ...])\n=========================== short test summary info ============================\nFAILED test_ladder.py::test_classic_example - AssertionError: assert 6 == 5\nFAILED test_ladder.py::test_unreachable_end - AssertionError: assert 6 == 0\nFAILED test_ladder.py::test_single_step - AssertionError: assert 3 == 2\nFAILED test_ladder.py::test_shortest_is_found - AssertionError: assert 4 == 3\nFAILED test_ladder.py::test_larger_input_is_fast - AssertionError: assert 5 == 4\n5 failed in 0.04s\n" } ], "files": { "ladder.py": "from collections import deque\n\ndef ladder_length(begin: str, end: str, word_list: list[str]) -> int:\n if begin == end:\n return 0\n visited = set([begin])\n queue = deque([(begin, 1)])\n while queue:\n current_word, steps = queue.popleft()\n for i in range(len(current_word)):\n for c in 'abcdefghijklmnopqrstuvwxyz':\n new_word = current_word[:i] + c + current_word[i+1:]\n if new_word == end:\n return steps + 2\n if new_word in word_list and new_word not in visited:\n visited.add(new_word)\n queue.append((new_word, steps + 1))\n return 0" }, "file_metrics": [ { "path": "ladder.py", "loc": 18, "sloc": 17, "chars": 677, "is_python": true, "functions": 1, "classes": 0, "complexity": 8, "max_complexity": 8, "max_depth": 5, "imports": [ "collections" ], "avg_function_len": 16.0, "parse_error": false } ], "code": { "files": 1, "loc": 18, "sloc": 17, "chars": 677, "functions": 1, "classes": 0, "complexity": 8, "max_complexity": 8, "max_depth": 5, "imports": [ "collections" ], "avg_function_len": 16.0, "parse_errors": 0 }, "session": { "model_calls": 1, "actions": {}, "bad_actions": 0, "test_runs": 0, "tokens_out": 185, "tokens_in": 0, "turns": 0 }, "test_output": "FFFFF [100%]\n=================================== FAILURES ===================================\n_____________________________ test_classic_example _____________________________\ntest_ladder.py:7: in test_classic_example\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\", \"cog\"]) == 5\nE AssertionError: assert 6 == 5\nE + where 6 = ladder_length('hit', 'cog', ['hot', 'dot', 'dog', 'lot', 'log', 'cog'])\n_____________________________ test_unreachable_end _____________________________\ntest_ladder.py:11: in test_unreachable_end\n assert ladder_length(\"hit\", \"cog\", [\"hot\", \"dot\", \"dog\", \"lot\", \"log\"]) == 0\nE AssertionError: assert 6 == 0\nE + where 6 = ladder_length('hit', 'cog', ['hot', 'dot', 'dog', 'lot', 'log'])\n_______________________________ test_single_step _______________________________\ntest_ladder.py:15: in test_single_step\n assert ladder_length(\"a\", \"c\", [\"a\", \"b\", \"c\"]) == 2\nE AssertionError: assert 3 == 2\nE + where 3 = ladder_length('a', 'c', ['a', 'b', 'c'])\n____________________________ test_shortest_is_found ____________________________\ntest_ladder.py:20: in test_shortest_is_found\n assert ladder_length(\"hit\", \"cot\", words) == 3\nE AssertionError: assert 4 == 3\nE + where 4 = ladder_length('hit', 'cot', ['hot', 'hit', 'hat', 'cat', 'cot', 'cog', ...])\n__________________________ test_larger_input_is_fast ___________________________\ntest_ladder.py:26: in test_larger_input_is_fast\n assert ladder_length(\"aaa\", \"hhh\", words) == 4\nE AssertionError: assert 5 == 4\nE + where 5 = ladder_length('aaa', 'hhh', ['aaa', 'aab', 'aac', 'aad', 'aae', 'aaf', ...])\n=========================== short test summary info ============================\nFAILED test_ladder.py::test_classic_example - AssertionError: assert 6 == 5\nFAILED test_ladder.py::test_unreachable_end - AssertionError: assert 6 == 0\nFAILED test_ladder.py::test_single_step - AssertionError: assert 3 == 2\nFAILED test_ladder.py::test_shortest_is_found - AssertionError: assert 4 == 3\nFAILED test_ladder.py::test_larger_input_is_fast - AssertionError: assert 5 == 4\n5 failed in 0.04s\n" }