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按题目给的tips，s+=s；之后从头开始遍历，找到所有的r...w...b结构，记录首尾两个offset然后向左右遍历，遇到w或者与对应的offset处一样的话长度就++； 坑：最后结果如果大于n说明有重复如果为0说明全为w防止漏掉结尾一段，手动给结尾处一个断代码：变量解释：n长度；s字符串；tc储存遍历时当前的颜色；of1,of2前后两个偏移；tof1,tof2临时；almax最长长度；tm

Milking Cows Three farmers rise at 5 am each morning and head for the barnto milk three cows. The first farmer begins milking his cow at time300 (measured in seconds after 5 am) and ends at time 10