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            "categoryTitle": "Database",
            "boundTopicId": 491034,
            "title": "Average Time of Process per Machine",
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            "content": null,
            "translatedTitle": "每台机器的进程平均运行时间",
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            "topicTags": [
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                    "name": "Database",
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            "sampleTestCase": "{\"headers\":{\"Activity\":[\"machine_id\",\"process_id\",\"activity_type\",\"timestamp\"]},\"rows\":{\"Activity\":[[0,0,\"start\",0.712],[0,0,\"end\",1.52],[0,1,\"start\",3.14],[0,1,\"end\",4.12],[1,0,\"start\",0.55],[1,0,\"end\",1.55],[1,1,\"start\",0.43],[1,1,\"end\",1.42],[2,0,\"start\",4.1],[2,0,\"end\",4.512],[2,1,\"start\",2.5],[2,1,\"end\",5]]}}",
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                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '0', 'end', '1.52')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '1', 'start', '3.14')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('0', '1', 'end', '4.12')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '0', 'start', '0.55')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '0', 'end', '1.55')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '1', 'start', '0.43')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('1', '1', 'end', '1.42')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '0', 'start', '4.1')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '0', 'end', '4.512')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '1', 'start', '2.5')",
                "insert into Activity (machine_id, process_id, activity_type, timestamp) values ('2', '1', 'end', '5')"
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            "editorType": "CKEDITOR",
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            "style": "LEETCODE",
            "exampleTestcases": "{\"headers\":{\"Activity\":[\"machine_id\",\"process_id\",\"activity_type\",\"timestamp\"]},\"rows\":{\"Activity\":[[0,0,\"start\",0.712],[0,0,\"end\",1.52],[0,1,\"start\",3.14],[0,1,\"end\",4.12],[1,0,\"start\",0.55],[1,0,\"end\",1.55],[1,1,\"start\",0.43],[1,1,\"end\",1.42],[2,0,\"start\",4.1],[2,0,\"end\",4.512],[2,1,\"start\",2.5],[2,1,\"end\",5]]}}",
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