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用大、小、中方法的，看看这组数据5 3 1 4 2 5 0 注意1和2，这里不能用a[i]与a[i-1]或a[i+1]之类的判断， 还是老老实实用n以后所有小于n的都要降序来做吧 n^2级 Followed by:
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