You could just join the nearest crowd or take your place in the longest line.
你可以选择就近扎堆，或者是在最长的队伍里找到自己的位置。
Dubai is already home to the world's longest driverless rail line.
迪拜已经拥有全球最长的无人驾驶铁路线。
To break the record for the world's longest taco line.
他们要打破世界上最长玉米卷的记录。
For each test case, print the length of the longest road on a single line.
求图中的一条最长路径，又是回溯。
For each test case, print the length of the longest road on a single line.
求图中的一条最长路径，又是回溯。
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