摘要： Description In the army, a platoon is composed by n soldiers. During the morning inspection, the soldiers are aligned in a straight line in front of t 阅读全文

摘要： Description By definition palindrome is a string which is not changed when reversed. "MADAM" is a nice example of palindrome. It is an easy job to tes 阅读全文

摘要： Description A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = < x1, x2, ..., x 阅读全文