题意 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. 找出一个数组中的三个数,使这三个数的和为0.输出所有的组合,不能重复. 解法 最简单的思路就是跑一个三层循环,暴力枚举所有组合,很显然会超时. 然后考虑排序后跑两层循环,第三层改用二…

题意 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. You may assume that each input would have exactly one solution. 给定一个数组及一个目标值,找出三个数,使它们的和与目标值的差值最…

Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For example, given nums = [-2, 0, 1, 3], and target = 2. Retu…

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. You may assume that each input would have exactly one solution. For example, given array S = {-1 2…

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. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The solut…

原题链接在这里:https://leetcode.com/problems/3sum-smaller/ 题目: Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. For e…

import java.util.*; /** * Source : https://oj.leetcode.com/problems/3sum/ * * Created by lverpeng on 2017/7/10. * * 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…

题意 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 gives the sum of target. 给定一个数组,找出其中的四个数,使它们的和等于某个特定的数 解法 和2Sum以及3Sum一样,都是先排序然后遍历前面几个数,剩下的两个数用T…

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. Note: The solution set must not contain duplicate triplets. For example, given array S = [-1,…

3Sum Closest 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. You may assume that each input would have exactly one solution. For example, given arr…