摘要：
Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below a... 阅读全文
摘要：
Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321解题思路：将数字翻转并不难，可以转成String类型翻转，也可以逐位翻转，本题涉及到的主要是边界和溢出问题，使用Long... 阅读全文
摘要：
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font ... 阅读全文
摘要：
Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longes... 阅读全文