Lintcode57 3Sum solution 题解
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【题目描述】
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 zero.
Notice:Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)The solution set must not contain duplicate triplets.
给出一个有n个整数的数组S,在S中找到三个整数a, b, c,找到所有使得a + b + c = 0的三元组。
注意:在三元组(a, b, c),要求a <= b <= c。结果不能包含重复的三元组。
【题目链接】
http://www.lintcode.com/en/problem/3sum/
【题目解析】
方法一:
两层循环+二分查找,复杂度O(n^2 logn). 太慢了
方法二:
一层循环加two sum思想(https://leetcode.com/problems/two-sum/),O(n^2).
【参考答案】
www.jiuzhang.com/solutions/3sum/
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