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AC了,说一下思路吧.

Posted by humanjustic at 2006-11-21 18:32:07 on Problem 1852 
1.在求最小时间时,只要考虑往各自最优方向的最大值即可.
说明白点就是,如果棒长6,一个Ant在2处,那么它的最优方向是朝左走,故时间是2;一个Ant在3处,那么它的最优方向是向右走,时间是3.所以最小时间是2.
2.在求最大时间时,只要考虑往各自最坏方向的最大值即可.
如果棒长是5,一个Ant在1处,它的最坏方向是向右走,时间是4;一个Ant在3处,它的最坏方向是向左走,时间是3.
所以最长时间是4.

Just Greedy..
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