摘要：
题目如下： Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two 阅读全文
摘要：
题目如下： Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the t 阅读全文
摘要：
题目如下： 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 阅读全文
摘要：
题目如下： Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 Note:The input is assumed to be a 32-bit signed integ 阅读全文
摘要：
题目如下： Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which th 阅读全文
摘要：
You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contai 阅读全文