标签存档: FOJ1906

FOJ 1906解题报告

Problem Description

There is a sequence that only consists of characters ‘/’ and ‘’. You should calculate the number of down sequences and up sequences respectively in the given sequence.
A down sequence is defined as follows:

1. “/” is a down sequence.
2. If S is a down sequence, then “S/” is also a down sequence.
3. Any other sequences are not a down sequences.

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