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4Sum
【Ksum】求和问题总结(leetcode 2Sum, 3Sum,
4Sum
, K Sum)
前言:做过leetcode的人都知道,里面有2sum,3sum(closest),
4sum
等问题,这些也是面试里面经典的问题,考察是否能够合理利用排序这个性质,一步一步得到高效的算法.经过总结,本人觉得这些问题都可以使用一个通用的
brandohero
·
2014-11-14 07:00
LeetCode 135
4Sum
GivenanarraySofnintegers,arethereelementsa,b,c,anddinSsuchthata+b+c+d=target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinnon-descendingorder.(
ustc_summer
·
2014-11-01 14:00
LeetCode
4sum
【LeetCode】
4Sum
解题报告
【题目】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)mustbe
ljiabin
·
2014-10-31 10:00
LeetCode
Algorithm
SUM
K
4sum
[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
hale1007
·
2014-10-23 12:00
4sum
与3sum思路一样,先将数组排序。然后依次遍历,将问题转化为3sum,再转化为2sum。最终问题得到解决。注意2sum函数的参数,要包含第一个add到list里的数。publicList>fourSum(int[]num,inttarget){ List>lists=newArrayList>(); intlen=num.length,i=0,j=0; if(len>lists){ intlen=
okiwilldoit
·
2014-09-29 17:00
2Sum 3Sum
4Sum
一、2SumTwoSum TotalAccepted: 31961 TotalSubmissions: 172332MySubmissionsGivenanarrayofintegers,findtwonumberssuchthattheyadduptoaspecifictargetnumber.ThefunctiontwoSumshouldreturnindicesofthetwonumbers
ahero_happy
·
2014-09-12 13:00
[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
u014691362
·
2014-08-28 21:00
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
ozhaohuafei
·
2014-08-23 16:00
LeetCode
欧拉公式
V:点数,E:边数 F:面数欧拉公式V-E+F=2;V= n+n/
4sum
(i*(n-2-i)); [0 #include #include #include #include #include #include
u013451221
·
2014-08-14 19:00
[leetcode]
4Sum
4Sum
先排序,三重循环,第三重循环内使用夹逼classSolution{ public: vector>fourSum(vector&num,inttarget){ vector>res; res.clear
lydyangliu
·
2014-08-02 17:00
[leetcode]
4Sum
新博文地址:[leetcode]
4Sum
4Sum
Given an array S of n integers, are there elements a, b, c, and d in S such
huntfor
·
2014-06-26 20:00
LeetCode
[leetcode]
4Sum
GivenanarraySofnintegers,arethereelementsa,b,c,anddinSsuchthata+b+c+d=target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinnon-descendingorder.(
jdflyfly
·
2014-06-24 21:00
java
LeetCode
Leetcode:
4Sum
思路:这次解法的时间复杂度是O(n^3),过程如下:1、先对数组排序;2、一次选出数组的两个元素;3、再前面两个元素的后面分别标记两个前后索引,得到新的两个元素,与前面的两个元素相加,有3种情况考虑,1)如果和等于目标值,得到一个解,前索引后移,后索引前移去发掘新的解,2)如果和大于目标值,后索引前移以便减少和,3)和小于目标值,前索引后移增大和;4、回到第2步,直到挑选完所有的数组元素。注意:因
AIvin24
·
2014-06-20 09:00
LeetCode 17.
4Sum
和LeetCode15.3Sum的思路一样1.num排升序2.双重for循环,表示前两数个a,b3.while(c>fourSum(vector&num,inttarget) { vector>ret; sort(num.begin(),num.end()); for(size_ta=0;anum[a]+num[b]+num[c]+num[d]) { ++c; }elseif(targetite
u014674776
·
2014-06-14 08:00
LeetCode
C++
数据结构与算法[LeetCode]
4Sum
ivenanarray 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)mustbeinnon
SUN20082567
·
2014-06-12 19:00
[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
sbitswc
·
2014-06-05 23:00
LeetCode
SUM
每日算法之十六:
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
yapian8
·
2014-05-25 21:00
4sum
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
Andrewseu
·
2014-05-21 22:00
LeetCode
优化
vector
leetcode 3Sum 3Sum Closest
4Sum
这几个题很典型也是国外一些知名公司经常会问到的题3Sum:排序,避免重复,时间复杂度O(n^2)classSolution{ public: vector>threeSum(vector&num){ intlen=num.size(); sort(num.begin(),num.begin()+len); vector>ret; ret.clear(); if(len0&&num[i]==num
Qxietingwen
·
2014-05-21 22:00
4Sum
-- LeetCode
原题链接: http://oj.leetcode.com/problems/
4sum
/ 这道题要求跟3Sum差不多,只是需求扩展到四个的数字的和了。
linhuanmars
·
2014-05-01 04:00
java
LeetCode
排序
面试
SUM
[leetcode]
4Sum
@ Python
原题地址:http://oj.leetcode.com/problems/
4sum
/ 题意:从数组中找到4个数,使它们的和为target。要求去重,可能有多组解,需要都找出来。
·
2014-04-29 15:00
LeetCode
LeetCode 求和问题总结(2sum,3sum,ksum)
sigmainfy博客原文:http://tech-wonderland.net/blog/summary-of-ksum-problems.html求和问题总结(leetcode2Sum,3Sum,
4Sum
chenlong226
·
2014-04-26 17:51
leetcode
c++
程序开发中常用的N种算法和数据结构
5、一些高级算法:推荐网站http://leetcode.com/ 字梯问题, 合并插入间隔,(2sum,3sum,
4sum
),字符串转整数
张佳亮
·
2014-04-19 01:00
LeetCode(3 Sum,
4sum
, ksum)
题目要求:Givenanarray S of n integers,arethereelements a, b, c in S suchthat a + b + c =0?Findalluniquetripletsinthearraywhichgivesthesumofzero.Note:Elementsinatriplet(a,b,c)mustbeinnon-descendingorder.(i
lqcsp
·
2014-04-11 04:00
LeetCode
面试
DFS
Ksum
LeetCode:3Sum, 3Sum Closest,
4Sum
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 m
·
2014-04-07 00:00
LeetCode
找出数组中和为指定值的四个数
4sum
问题: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)mustbei
luckyjoy521
·
2014-03-18 22:00
LeetCode 题解(17):
4Sum
题目:GivenanarraySofnintegers,arethereelementsa,b,c,anddinSsuchthata+b+c+d=target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinnon-descendingorde
u011029779
·
2014-02-25 05:00
Algorithm
LeetCode
4sum
【LeetCode】3Sum && 3Sum Closest &&
4Sum
1、3Sum TotalAccepted:7974TotalSubmissions:47933MySubmissionsGivenanarraySofnintegers,arethereelementsa,b,cinSsuchthata+b+c=0?Findalluniquetripletsinthearraywhichgivesthesumofzero.Note:Elementsinatripl
u013027996
·
2014-02-19 14:00
[LeetCode]
4Sum
, 解题报告
前言明天就要回京了,还是挺紧张的,今天还是要坚持的做做题目,看看android,晚上收拾一下行李,不得不说,家里还是很舒服的,尤其是搬了新家之后,我还有自己的书房,开心上传一张图片,纪念一下,哎,博客写的越来越随意了题目GivenanarraySofnintegers,arethereelementsa,b,c,anddinSsuchthata+b+c+d=target?Findallunique
zinss26914
·
2014-02-14 12:00
LeetCode OJ:
4Sum
4Sum
Givenanarray S of n integers,arethereelements a, b, c,and d in S suchthat a + b + c + d =target?
starcuan
·
2014-01-30 23:00
LeetCode
[LeetCode]18.4Sum
【题目】
4Sum
TotalAccepted: 3493 TotalSubmissions: 16137MySubmissionsGivenanarray S of n integers,arethereelements
SunnyYoona
·
2014-01-18 18:00
LeetCode
面试
校园招聘
剑指offer
LeetCode之K sum problem
做过leetcode的人都知道,里面有2sum,3sum(closest),
4sum
等问题,这些也是面试里面经典的问题,考察是否能够合理利用排序这个性质,一步一步得到高效的算法.经过总结,本人觉得这些问题都可以使用一个通用的
SunnyYoona
·
2014-01-18 12:00
LeetCode
面试
校园招聘
剑指offer
4Sum
问题
与以下题目相似 http://oj.leetcode.com/problems/
4sum
/解题思路: 暴力解法(四重循环),效率很低 利用hash的方法:先将数据两两相加,将和作为key,将两个数据组成的集合作为值
kisuntechker
·
2013-12-21 22:45
算法
4sum
hash方法
4Sum
问题
与以下题目相似http://oj.leetcode.com/problems/
4sum
/解题思路:暴力解法(四重循环),效率很低利用hash的方法:先将数据两两相加,将和作为key,将两个数据组成的集合作为值
kisuntechker
·
2013-12-21 22:45
算法
4sum
hash方法
算法与数据结构
4Sum
(C++实现)
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)mustbeinn
windshg
·
2013-12-12 19:00
C++
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
kenden23
·
2013-11-26 09:00
LeetCode
4sum
[置顶] 3Sum 3Sum Closest
4Sum
难度:33Sum的题意:给出一列数,找出所有的满足条件的三个数,条件:三个数相加等于0 3SumClosest的题意:给出一列数,找出三个数使得三个数相加最接近target4Sum:和3sum一样,不过是4个数解法:都一样。。基本改几行就能过另外两个题3Sum的解法:按从小到大排序假设找到的三个数a,b,c满足a+b+c=0a-a时,为减小b+c,应使得c左移当b+c=a时,记录结果O(n^2)3
zhangwei1120112119
·
2013-11-15 18:00
K sum 问题
求和问题总结(leetcode2Sum,3Sum,
4Sum
,KSum)发表于2013年1月8日作者sigmainfy浏览次数:1,612次—暂无评论↓前言:做过leetcode的人都知道,里面有2sum
Simon253
·
2013-11-09 09:00
4Sum
找4个数之和为target@LeetCode
importjava.util.ArrayList; importjava.util.Arrays; importjava.util.HashSet; importjava.util.Set; /** *
4Sum
hellobinfeng
·
2013-11-04 07:00
[leetcode] 求和问题总结(2Sum, 3Sum,
4Sum
, K Sum)
前言:做过leetcode的人都知道,里面有2sum,3sum(closest),
4sum
等问题,这些也是面试里面经典的问题,考察是否能够合理利用排序这个性质,一步一步得到高效的算法.经过总结,本人觉得这些问题都可以使用一个通用的
SciPioneer
·
2013-11-03 14:03
Interview
[leetcode] 求和问题总结(2Sum, 3Sum,
4Sum
, K Sum)
前言:做过leetcode的人都知道,里面有2sum,3sum(closest),
4sum
等问题,这些也是面试里面经典的问题,考察是否能够合理利用排序这个性质,一步一步得到高效的算法.经过总结,本人觉得这些问题都可以使用一个通用的
bhwolf1987
·
2013-11-03 14:00
LeetCode
SUM
K
4sum
2Sum
3Sum
[LeetCode] 2Sum, 3Sum,
4Sum
, 3SUm closet
1.2Sum:hashTableO(n*n)2.3Sum:2Sum+1:O(n*n)forloop+左右夹逼法:O(N*N)classSolution{public: vector>threeSum(vector&num){ //Note:TheSolutionobjectisinstantiatedonlyonceandisreusedbyeachtestcase. vector>
jellyYin
·
2013-10-27 09:00
求和问题总结(leetcode 2Sum, 3Sum,
4Sum
, K Sum)
前言:做过leetcode的人都知道,里面有2sum,3sum(closest),
4sum
等问题,这些也是面试里面经典的问题,考察是否能够合理利用排序这个性质,一步一步得到高效的算法.经过总结,本人觉得这些问题都可以使用一个通用的
suwei19870312
·
2013-10-18 18:00
4Sum
数组中寻找四个数满足a+b+c+d=target
其实很简单的思想,4个数,其实就是2+2,所以把数组的所有pairs和存入hash数组中,但要注意的一点是相同值不同位置的要区别对待。所以我存放的时候是sum值,与位置indexpair。然后根据a+b=target的方式求到对应的value组合即可。publicclassSolution{publicArrayList>fourSum(int[]num,inttarget){//Note:The
andy_su1990
·
2013-10-14 01:07
算法
求和问题总结(leetcode 2Sum, 3Sum,
4Sum
, K Sum)
http://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
nanjunxiao
·
2013-10-09 20:00
LeetCode
求和问题总结(leetcode 2Sum, 3Sum,
4Sum
, K Sum)
sigmainfy—http://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
doc_sgl
·
2013-10-09 00:19
程序员笔试面试
算法与数据结构
求和问题总结(leetcode 2Sum, 3Sum,
4Sum
, K Sum)
sigmainfy—http://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
doc_sgl
·
2013-10-09 00:00
LeetCode
SUM
K
4sum
3Sum
2Sum
Leetcode:
4Sum
GivenanarraySofnintegers,arethereelementsa,b,c,anddinSsuchthata+b+c+d=target?Findalluniquequadrupletsinthearraywhichgivesthesumoftarget.Note:Elementsinaquadruplet(a,b,c,d)mustbeinnon-descendingorder.(
doc_sgl
·
2013-10-08 12:00
LeetCode
4sum
[leetcode刷题系列]
4Sum
囧,就在3sum上面的基础上改一下就好了classvector_int_hash{ conststaticintP=10007; conststaticintMOD=1e9+7; public: size_toperator()(constvector&v)const{ longlongnow=0; for(inti=0;i&a,constvector&b)const{ if(a.size()!=
sigh1988
·
2013-08-16 18:00
[LeetCode] Two Sum, 3Sum ,3SumCloset ,
4Sum
TwoSum:Givenanarrayofintegers,findtwonumberssuchthattheyadduptoaspecifictargetnumber.ThefunctiontwoSumshouldreturnindicesofthetwonumberssuchthattheyadduptothetarget,whereindex1mustbelessthanindex2.Ple
a83610312
·
2013-07-24 20:00
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