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这题有问题?个人感觉。。。因为假如我把所有的BN点都放在AN点上。。那么长度就是AN-A1,为什么这样做却过不了呢? 如序列为1 6 8 7 9。那么AC的结果为9,按上面思路解出来的是8。。这更短啊~! Followed by:
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