摘要：1. Search in Rotated Sorted Array Suppose an array sorted in ascending order is rotated(轮流，循环) at some pivot(枢轴; 中心点) unknown to you beforehand(提前; 事先 阅读全文

摘要：1. Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the li 阅读全文

摘要：1. 4Sum Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the ar 阅读全文

摘要：1. Container With Most Water Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are 阅读全文

摘要：1. Longest Palindromic Substring Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. E 阅读全文

摘要：1. 1-bit and 2-bit Characters We have two special characters. The first character can be represented by one bit 0. The second character can be represe 阅读全文