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比较前后的字符，不相等的次数*2

Posted by lw656697751 at 2008-07-19 10:36:15 on Problem 1159 
> 比如字符串 a[7]={a,b,c,d,a,b,c}，我比较a[0]和a[6],a[1]和a[5],a[2]和a[4],他们都不相等，不相等的次数为3，插入的字符的个数应该是6啊，我试过好多数据了，提交上去就是错的，请问这样的算法是错的么？错在哪里啊？
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