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How to count 1 for the second case....

Posted by AngelClover at 2009-04-05 14:54:58 on Problem 3729
5 5 3
1 2 1 2 3
1 2 3 4 5


如果S3串是123这个串,那么extend S3也是123.
那么123既在S2又不在S2中的话也可以算是1个?

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