while(j<31 && !(h=free_table[j])) ++j;
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，更多细节参见旺商聊官方下载
（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；，详情可参考同城约会
// 核心逻辑：当前时间 上一个车队时间 → 无法合并，是新车队