题目修改记录

{
    "id": 0,
    "user_id": 0,
    "problem_id": 0,
    "title": "string",
    "source": "string",
    "difficulty": 0,
    "time_limit": 0,
    "memory_limit": 0,
    "description": "string",
    "input": "string",
    "output": "string",
    "sample_input": "string",
    "sample_output": "string",
    "hint": "string",
    "operation": 0,
    "create_time": "string"
}