归档 2016年4月7日

[TopCoder]SRM 687 Div2 Quacking

题目描述:

Ducks have started mysteriously appearing in your room. All ducks make the same sound: "quack". Each duck makes the sound one or more times, one after another. For example, valid sounds for a single duck are "quack", "quackquackquackquack", "quackquack" ...

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