摘要：Description: Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the fi 阅读全文

摘要：Description: 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 阅读全文

摘要：Description: Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Example 2: 阅读全文

摘要：Description: Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", w 阅读全文

摘要：Description: You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their 阅读全文