Given a 2d grid map of '1's (land) and '0's (water), count the number of...

Customer ObsessionLeaders start with the customer and work backward. The...

We have a list of points on the plane. Find the K closest points to the...

Given a string s, find the longest palindromic substring in s. You may a...

15. 3Sum Given an array nums of n integers, are there elements a, b, c i...

今天主要将自己刷的2sum和相关的一些同一类型的题目做个summary。正所谓‘平生不识TwoSum，刷尽LeetCode也枉然’ 1. 2su...