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AC了，交流下思路仔细想想，最好情况是不发生任何collide的情况，试想只要发生了collide时间必然增加，这个应该好理解；最长的时间呢？考虑最远的一只蚂蚁，当发生碰触时，两只蚂蚁掉头走相当于两只蚂蚁继续走，为什么呢？因为蚂蚁的速度是相同的～～，蚂蚁在这里的表现特征没有任何差别。 Followed by:
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