摘要：
Palindrome Number 问题描述如下： Determine whether an integer is a palindrome. Do this without extra space. 关键在不占用额外的空间的情况下生成它的回文序列，然后作差即可。 如果相等，说明回文，如果不相等说明 阅读全文
摘要：
Count and Say The count-and-say sequence is the sequence of integers with the first five terms as following: 1 is read off as "one 1" or 11.11 is read 阅读全文