摘要：
题目： 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 array 阅读全文
摘要：
题目： 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 阅读全文
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题目： 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 hav 阅读全文
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题目： 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 co 阅读全文