摘要:
There are several ancient Greek texts that contain descriptions of the fabled island Atlantis. Some of these texts even include maps of parts of the i 阅读全文
摘要:
During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Generally speaking, vil 阅读全文
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The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ag 阅读全文
摘要:
You are given a number of case-sensitive strings of alphabetic characters, find the largest string X, such that either X, or its inverse can be found 阅读全文