题意:找到最接近target的3个元素之和,并返回该和. 思路:用2个指针,时间复杂度O(n^2). int threeSumClosest(vector<int>& nums, int target) { ]+nums[]+nums[]; sort(nums.begin(), nums.end()); ; i<nums.size()-; i++) { , q=nums.size()-; while( p!=q ) { int tmp=target-(nums[i]+nums[p…
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…
1).2sum 1.题意:找出数组中和为target的所有数对 2.思路:排序数组,然后用两个指针i.j,一前一后,计算两个指针所指内容的和与target的关系,如果小于target,i右移,如果大于,j左移,否则为其中一个解 3.时间复杂度:O(nlgn)+O(n) 4.空间:O(1) 5.代码: void twoSum(vector<int>& nums,int numsSize,int target,vector<vector<int>>& two…
# -*- 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…
1. Two Sum 题目链接 题目要求: Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than ind…
1.  Container With Most Water Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two lines, which togethe…
目录 题目链接 注意点 解法 小结 题目链接 3Sum Closest - LeetCode 注意点 和3Sum那道题的target是0,这道题是题目给定的 要先计算误差再移动指针 解法 解法一:做法类似3Sum那道题解法二,每次移动指针前先计算误差,如果误差为0,直接返回target即可.时间复杂度为O(n^2) class Solution { public: int threeSumClosest(vector<int>& nums, int target) { sort(num…
1.two sum 用hash来存储数值和对应的位置索引,通过target-当前值来获得需要的值,然后再hash中寻找 错误代码1: Input:[3,2,4]6Output:[0,0]Expected:[1,2] 同一个数字不能重复使用,但这个代码没排除这个问题 class Solution { public: vector<int> twoSum(vector<int>& nums, int target) { vector<int> result; uno…
LeetCode 16. 3Sum Closest(最接近的三数之和)…
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…