摘要：
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 which 阅读全文
摘要：
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. 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 z 阅读全文