problem: given an array of integers including positive and negative, a target value. find 2 numbers in the array such that the sum of the 2 numbers is the closest to the target value. Solution: this can be solved in O(nlogn). First, invest some time…

题目链接 https://leetcode.com/problems/3sum-closest/?tab=Description     Problem : 找到给定数组中a+b+c 最接近target的组合   类似求三个数之和为0的思路:每次更新求和的result值,利用函数Math.abs()判断绝对值最小的为result   参考代码: package leetcode_50; import java.util.Arrays; /*** * * @author pengfei_zheng…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 16: 3Sum Closesthttps://oj.leetcode.com/problems/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…

原版 sorted ［抄题］: ［思维问题］: 存sum - nums[i](补集),若出现第二次则调出 ［一句话思路］: hashmap中,重要的数值当做key,角标当做value. ［画图］: ［一刷］: ［总结］: ［复杂度］:n/n ［英文数据结构,为什么不用别的数据结构］: 2根指针 n^2 ［其他解法］:2根指针 j＝i + 1 ［题目变变变］: Subarray Sum Equals K map Two Sum IV - Input is a BST class Solution…

Two Sum: 解法一:排序后使用双索引对撞:O(nlogn)+O(n) = O(nlogn) , 但是返回的是排序前的指针. 解法二:查找表.将所有元素放入查找表, 之后对于每一个元素a,查找 target-a 是否存在.使用map实现,键是元素的值,键值是元素对应的索引. 不能把vector中所有的值放到查找表中,因为若有重复的值,前一个会被后一个覆盖.所以改善为把当前元素v前面的元素放到查找表中. 时间复杂度:O(n) 空间复杂度:O(n) 注意:这道题只有唯一解. class Solu…

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…

问题: 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…

16. 3Sum Closest Total Accepted: 86565 Total Submissions: 291260 Difficulty: Medium 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…

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…

题目难度:Medium 题目: 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. 翻译: 给定一个n个整数的数组S,在S…