4sum 第6页

Statistics: third record for leetcode

name status note 3Sum Closest 1 3Sum 2 4Sum 1 Add Binary 1

·2015-11-13 11:54

LeetCode: 4Sum

一次过 1 class Solution { 2 public: 3 vector<vector<int> > fourSum(vector<int> &num, int target) { 4 // Start typing your C/C++ solution below 5 /

·2015-11-13 09:09

LeetCode first time record

name status note 3Sum Closest 1 3Sum less 4Sum 1 Add Binary less

·2015-11-13 09:08

leetcode第17题--4Sum

Problem:Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d =

·2015-11-13 08:38

LeetCode Online Judge 题目C# 练习 - 4SUM

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-13 08:40

[leetcode] 4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-13 07:34

[LeetCode]4Sum

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. Note: Elements in

·2015-11-13 07:23

18. 4Sum

题目: Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = tar

·2015-11-13 03:37

【leetcode】4Sum

4Sum Given an array S of n integers, are there elements a, b, c

·2015-11-13 00:20

LeetCode 4sum

链接：https://oj.leetcode.com/problems/4sum/ 一种方法是跟3sum一样，使用头尾指针交替移动，时间复杂度为O(n3),空间复杂度为O(1),注意去重

·2015-11-12 23:38

Java [leetcode 18]4Sum

问题描述： 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. Note: Elem

·2015-11-12 19:31

4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-12 16:37

[LeetCode][Python]18: 4Sum

-*- coding: utf8 -*-'''__author__ = '[email protected]'18: 4Sumhttps://oj.leetcode.com/problems/4sum

·2015-11-12 11:46

**4sum*

题目： 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. Note: Element

·2015-11-11 19:18

4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-11 18:02

【LeetCode】4Sum 解题报告

【题目】 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d =

·2015-11-11 18:35

4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-11 16:07

leetcode 整理

4Sum两两一组然后在对pair进行操作。 2.Median of Two Sorted Arrays 二分查找的应用。二分查找的结果肯定是start

·2015-11-11 15:43

求和问题总结(leetcode 2Sum, 3Sum, 4Sum, K Sum)

tech-wonderland.net/blog/summary-of-ksum-problems.html 前言: 做过leetcode的人都知道, 里面有2sum, 3sum(closest), 4sum

·2015-11-11 15:34

4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-11 15:33

4Sum

Question: Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d

·2015-11-11 10:05

4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-11 10:47

LeetCode题解——4Sum

题目：给定一个数组，找出其中和为0的所有4个数组合，每个组合内的4个数非递降。解法： ①先排序，然后利用4个指针，前两个遍历，后两个在第二个指针之后的部分里夹逼，时间O(N3)。 ②或者利用一个哈希表先保存每两个数的和，然后类似于查找两个数的和等于给定值的过程。代码： ① 1 class Solution { 2 public: 3

·2015-11-11 10:04

[leetcode]4Sum

这道4Sum，如果用3Sum类似的方法，是O(n^3)的复杂度。现在使用O(n^2)的空间呢，能达到O(n^2)的时间复杂度。

·2015-11-11 09:55

4Sum——LeetCode

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-11 01:19

[LeetCode]4Sum

Givenanarray S of n integers,arethereelements a, b, c,and d in S suchthat a + b + c + d =target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinno

CiaoLiang·2015-11-10 15:00

[LeetCode18]4Sum

题目来源：https://leetcode.com/problems/4sum/点击打开链接Givenanarray S of n integers,arethereelements a, b, c,and

hnxijie·2015-11-09 13:00

LeetCode Interview Questions Online Judge

LeetCode: http://www.leetcode.com/onlinejudge, Note: (Added 9/18/2012) 3Sum 3Sum Closest 4Sum Add

·2015-11-09 12:44

4Sum

求数组中和为target的4个数，结果的4个数是非降序，结果集合不能有重复。跟3Sum一样的解法。 vector<vector<int> > fourSum(vector<int> &num, int target) { vector<vector<int> > ret

·2015-11-09 12:20

Leetcode#15 3Sum

原题地址跟2sum、3sum、4sum、3sum closest一系列，参见这篇文章排序+DFS+剪枝+二分查找如果最后一个元素不二分查找会超时？？

·2015-11-09 12:04

Leetcode#16 3Sum Closest

原题地址跟2Sum、3Sum、4Sum类似，都是：排序+搜索+剪枝令sum = num[i] + num[j] + num[k] + (-target)（将-target看做一个必选的数

·2015-11-09 12:03

Leetcode#18 4Sum

原题地址标准DFS+剪枝。将数字提前排序，一来方便去重，二来创造剪枝条件。 1. 如果当前数字过大，就算加上最小的数字最后都超过target，停止继续尝试之后的数字，因为后面的数字更大 2. 如果当前数字过小，就算加上后面最大的数字最后都不到target，不用再考虑这个数字了，继续尝试后面更大的数字 3. 如果当前数字之前用过了，就直接跳过不再用了（去重） &nbs

·2015-11-09 12:01

4Sum

https://oj.leetcode.com/problems/4sum/ Given an array S of n integers, are there

·2015-11-09 11:06

Leetcode: 4Sum

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. Note: Elements in a

·2015-11-08 17:53

LeetCode18:4Sum

Givenanarray S of n integers,arethereelements a, b, c,and d in S suchthat a + b + c + d =target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinno

geekmanong·2015-11-08 15:00

【LeetCode】18. 4Sum (2 solutions)

4Sum Given an array S of n integers, are there elements a, b, c,

·2015-11-07 11:20

LeetCode – 4Sum

对于k-sum的时间复杂度，最坏是O（n^k）,最好的是O（n^(k-1)），对于时间复杂度的分析可以参考这篇文章http://blog.csdn.net/doc_sgl/article/details/12462151这篇博客的时间复杂度是O（n^（k-1））,写的特别好和精炼http://www.programcreek.com/2013/02/leetcode-4sum-java/我写了一个

lfdanding·2015-11-07 10:00

18 4Sum

类似的题目有1TwoSum153Sum163SumClosest第一次使用的是笨办法，四层嵌套for循环，总是超时publicstaticList>fourSum(int[]nums,inttarget){ List>result=newArrayList>(); Arrays.sort(nums); for(inta=0;alist=newArrayList(); list.add(nums[

taoxiuxia·2015-11-06 11:00

《leetCode》：4Sum

题目GivenanarraySofnintegers,arethereelementsa,b,c,anddinS suchthata+b+c+d=target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget. Note: Elementsinaquadruplet(a,b,c,d)mustbeinnon-descendingo

u010412719·2015-11-04 21:00

4Sum

4Sum 问题： Given an array S of n integers, are there elements a, b,

·2015-11-03 21:36

Leetcode 4Sum

先来一个暴力解： class Solution { public: vector<vector<int> > fourSum(vector<int> &num, int target) { vector<vector<int> > res; vector<int> r

·2015-11-02 19:22

[LeetCode] 4Sum

算法渣，现实基本都参考或者完全拷贝[戴方勤([email protected])]大神的leetcode题解，此处仅作刷题记录。 1 class Solution { 2 public: 3 vector<vector<int> > fourSum(vector<int> &num, int targ

·2015-11-02 17:23

【leetcode刷题笔记】4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-02 10:28

2sum、3sum、4sum以及任意连续的数的和为sum、任意连续或者不连续的数的和为sum

2sum 如果数组是无序的，先排序（n*logn），然后用两个指针i，j，各自指向数组的首尾两端，令i=0，j=n-1，然后i++，j--，逐次判断a[i]+a[j]?=sum，如果某一刻a[i]+a[j]>sum，则要想办法让sum 的值减小，所以此刻i 不动，j--，如果某一刻a[i]+a[j]<sum，则要想办法让sum 的值增大，所以此刻i++，j 不动。所以，数组无序的时候

·2015-11-01 15:46

[LeetCode] 4Sum hash表

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-11-01 14:53

LeetCode 4Sum 4个数之和

题意：这是继2sum和3sum之后的4sum，同理，也是找到所有4个元素序列，满足他们之和为target。

·2015-11-01 10:49

leetcode[18]4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-10-31 16:02

4sum

public class Solution { public ArrayList<ArrayList<Integer>> fourSum(int[] num, int target) { // the same as 3sum ArrayList<ArrayList<Integer>> res = ne

·2015-10-31 12:57

LeetCode - 4Sum

4Sum 2014.2.8 20:58 Given an array S of n integers, are there elements a,&

·2015-10-31 10:05

[Leetcode] 4Sum

Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target?

·2015-10-31 09:13

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4sum

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**4sum*