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注意,sample input里的v的最后一空格......

Posted by hheq121 at 2008-09-19 11:36:35 on Problem 2810
sample input里的v的最后一个空格是不应该没有的,
实际测试文件里是没有这个空格的,
不要自作主张把输出中v和a中间的穿删除!

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