摘要：
Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex 阅读全文
摘要：
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of 阅读全文
摘要：
Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the rans 阅读全文