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 solution set must not contain duplicate quadruplets. For exampl…

Given a list of numbers, find the number of tuples of size N that add to S. for example in the list (10,5,-1,3,4,-6), the tuple of size 4 (-1,3,4,-6) adds to 0. 题目: 给一数组,求数组中和为S的N个数 思路: 回溯法,数组中每个数都有两种选择,取或者不取: 当选择的数等于N时,则判断该数之和是否等于S. 代码: #include <io…

python解决方案 nums = [1,2,3,4,5,6] #假如这是给定的数组 target = 9 #假如这是给定的目标值 num_list = [] #用来装结果的容器 def run(nums,target): '''功能函数''' for num1 in nums: for num2 in nums: if num1 + num2 == target: num_list.append(num1) num_list.append(num2) print(num_list) break…

1.递归实现(参考:https://blog.csdn.net/hit_lk/article/details/53967627) public class Test { @org.junit.Test public void test() { System.out.println("方案数:" + getAllSchemeNum(new int[]{ 5, 5, 5, 2, 3 }, 15)); } // out : 方案数:4 /** * 从数组中选择和为sum的任意个数的组合数 *…

示例: nums = [1,2,5,7] target = [6] return [0,2] Python解决方案1: def twoSum(nums, target): """ :type nums: List[int] :type target: int :rtype: List[int] """ for i in range(len(nums)): remain = target - nums[i] if remain in nums an…

题目链接 https://leetcode.com/problems/4sum/?tab=Description 找到数组中满足 a+b+c+d=0的所有组合,要求不重复. Basic idea is using subfunctions for 3sum and 2sum, and keeping throwing all impossible cases. O(n^3) time complexity, O(1) extra space complexity. 首先进行判断,由于是四个数相加…

题目: 1. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Given nums = [2, 7, 1…

15 3sum Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. Example: Given array…

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…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 18: 4Sumhttps://oj.leetcode.com/problems/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 arr…