| {"id": "t2_001", "difficulty": 2, "bug_type": "wrong_variable", "function_name": "two_sum", "buggy_code": "def two_sum(nums, target):\n seen = {}\n for i, num in enumerate(nums):\n complement = target - num\n if complement in seen:\n return [seen[complement], i]\n seen[num] = num\n return []", "original_code": "def two_sum(nums, target):\n seen = {}\n for i, num in enumerate(nums):\n complement = target - num\n if complement in seen:\n return [seen[complement], i]\n seen[num] = i\n return []", "initial_error": "AssertionError: two_sum([2,7,11,15], 9) expected [0,1], got [2,1]", "bug_location": {"function": "two_sum", "line_start": 7}, "test_cases": [{"input": [[2, 7, 11, 15], 9], "expected_output": [0, 1]}, {"input": [[3, 2, 4], 6], "expected_output": [1, 2]}, {"input": [[3, 3], 6], "expected_output": [0, 1]}]} |
| {"id": "t2_002", "difficulty": 2, "bug_type": "missing_base_case", "function_name": "fibonacci", "buggy_code": "def fibonacci(n):\n if n == 0:\n return 0\n return fibonacci(n - 1) + fibonacci(n - 2)", "original_code": "def fibonacci(n):\n if n == 0:\n return 0\n if n == 1:\n return 1\n return fibonacci(n - 1) + fibonacci(n - 2)", "initial_error": "RecursionError: maximum recursion depth exceeded", "bug_location": {"function": "fibonacci", "line_start": 4}, "test_cases": [{"input": 0, "expected_output": 0}, {"input": 1, "expected_output": 1}, {"input": 5, "expected_output": 5}, {"input": 7, "expected_output": 13}]} |
| {"id": "t2_003", "difficulty": 2, "bug_type": "wrong_accumulator", "function_name": "flatten", "buggy_code": "def flatten(lst):\n result = []\n for item in lst:\n if isinstance(item, list):\n result.append(flatten(item))\n else:\n result.append(item)\n return result", "original_code": "def flatten(lst):\n result = []\n for item in lst:\n if isinstance(item, list):\n result.extend(flatten(item))\n else:\n result.append(item)\n return result", "initial_error": "AssertionError: flatten([[1,[2]],3]) expected [1,2,3], got [1,[2],3]", "bug_location": {"function": "flatten", "line_start": 5}, "test_cases": [{"input": [[1, [2]], 3], "expected_output": [1, 2, 3]}, {"input": [1, 2, 3], "expected_output": [1, 2, 3]}, {"input": [[1, 2], [3, [4, 5]]], "expected_output": [1, 2, 3, 4, 5]}]} |
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