单条提交记录（提交信息+评测结果）

{
    "stdout": "hello, world\n",
    "time": "0.001",
    "memory": 74680,
    "stderr": null,
    "token": "b17b92a3-2be0-4be4-9d41-996dafad46e8",
    "compile_output": null,
    "message": null,
    "status": {
        "id": 3,
        "description": "Accepted"
    }
}