4sum专题
LeetCode 18 4Sum
题意： 给出数组s和目标target，输出s中4个元素相加和为target的所有不同方案。 思路： 又是x sum问题，详见我的题解：http://blog.csdn.net/houserabbit/article/details/54707475 这题要注意的是去掉重复的方案，而且本题时间卡常数，代码要写的快一点。 代码： class Solution {publi
LeetCode 题解（17）: 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
LeetCode·18. 4Sum
题目： Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum o
leetcode18-4Sum
题目 给你一个由 n 个整数组成的数组 nums ，和一个目标值 target 。请你找出并返回满足下述全部条件且不重复的四元组 [nums[a], nums[b], nums[c], nums[d]] （若两个四元组元素一一对应，则认为两个四元组重复）： 0 <= a, b, c, d < n a、b、c 和 d 互不相同 nums[a] + nums[b] + nums[c] + nums[
【LeetCode算法练习（C++）】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: The solutio
【leetcode】454. 4Sum II【M】
Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have same len
leetcode:4Sum
思路：在3Sum基础上多加一个数，先将数组排序，然后先固定两个数i,j，设定两个指针，一个从i+1开始，一个从nums.length-1开始，根据sum和target的大小情况，分别移动两个指针，并将符合的情况保存下来。时间复杂度(O(n3))。 代码： public class FourSum18 {public static void main(String[] args) {int[
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. 在3Sum基础上改改就行 package
454. 4Sum II(Leetcode每日一题-2020.11.27)
Problem Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have s
454. 4Sum II leetcode binary search
Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have sam
454. 4Sum II leetcode binary search
Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have sam
数组（9）：4Sum
描述： 给定一个包含 n 个整数的数组 nums 和一个目标值 target，判断 nums 中是否存在四个元素 a，b，c 和 d ，使得 a + b + c + d 的值与 target 相等？找出所有满足条件且不重复的四元组。 注意： 答案中不可以包含重复的四元组。 分析： 先排序，然后左右夹逼，时间复杂度为O(n^3)，空间复杂度O(1)； 代码： class Solutio
leetcode454. 4Sum II四个数之和
题意 454. 4Sum II Medium Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all