摘要：
Figure: The house floats up in the sky by balloons. This picture is also used in 2018 KAIST RUN Spring Contest poster. In the year 2117, Professor Jae 阅读全文
摘要：
A string is palindrome, if the string reads the same backward and forward. For example, strings like "a", "aa", "appa", "queryreuq" are all palindrome 阅读全文