摘要： Description The word “the” is the most commonthree-letter word. It evenshows up inside other words, suchas “other” and “mathematics”.Sometimes it hide 阅读全文

摘要： Description If a string is in the form UVU, where U is not empty, and V has exactly L characters, we say UVUis an L-Gap string. For example, abcbabc i 阅读全文

摘要： The Number of Palindromes Problem Description Now, you are given a string S. We want to know how many distinct substring of S which is palindrome. Inp 阅读全文