leetcode974. Subarray Sums Divisible by K Given an array A of integers, return the number of (contiguous, non-empty) subarrays that have a sum divisible by K. Example 1: Note: 给定一个集合,求这个集合中子集的个数,其中对子集的要求是子集中元素的和能被k整除。 记数组pre[i+1]表示前 i...
所以我们简历Map存储累计和sum出现的次数,如果sum-k存在于map中,则累加和为k的子数组一定存在。 publicintsubarraySum(int[] nums,intk){ HashMap<Integer, Integer> map =newHashMap<>(); map.put(0,1);//初始加入0,例如nums【0】=10,k=10,如果0不在map中就少一个resintres=0;intcur=0;for(inti=...
关键词:Array, HashMap 关键点:把所有出现过的sum存入map:sum为key,出现的次数为value;利用map来找k (新sum - k =? 任何旧sum) 1classSolution2{3publicintsubarraySum(int[] nums,intk)4{5intcount = 0;6intsum = 0;78Map<Integer, Integer> map =newHashMap<>();9map.put(0, 1);//initial ...
LeetCode560. Subarray Sum Equals K Given an array of integersnumsand an integerk, returnthe total number of subarrays whose sum equals tok. A subarray is a contiguousnon-emptysequence of elements within an array. Example 1: Input: nums = [1,1,1], k = 2 Output: 2 Example 2: Input:...
找到 K 个最接近的元素 Find K Closest Elements 236 -- 14:39 App LeetCode力扣 207. 课程表 Course Schedule 56 -- 7:33 App LeetCode力扣 33. 搜索旋转排序数组Search in Rotated Sorted Array 421 -- 8:43 App Python每日一练-数组练习-运动和卡路里计算 37 -- 5:44 App LeetCode力扣 285. ...
Given an array nums and a target value k, find the maximum length of a subarray that sums to k. If there isn’t one, return 0 instead. Hashmap is also used in this problem. Iterate the array and calculate the sum, if map[sum-k] in the hashmap, update the maxlength=max(maxlength...
Leetcode 560. Subarray Sum Equals K Subarray Sum Equals K 题目大意:给定一个数组,要求找到不同的连续子序列,他们的和为k,问这样的连续子序列有多少个 题目思路:首先根据原始的想法,我们可以想到连续子序列的问题可以通过前缀和的方式进行解决,可以通过n^2的问题解决,但是这个做法并不太优,所以我们...
nums: [1, -1, 5, -2, 3], k = 3 sums: [1, 0, 5, 3, 6] 我们可以看到累积和的第四个数字为3,和k相同,则说明前四个数字就是符合题意的一个子数组,再来看第二个例子: nums: [-2, -1, 2, 1], k = 1 sums: [-2, -3, -1, 0] ...
LeetCode Top 100 Liked Questions 560. Subarray Sum Equals K (Java版; Medium) 题目描述 AI检测代码解析 Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k.
[Leetcode] 560. Subarray Sum Equals K Problem: https://leetcode.com/problems/subarray-sum-equals-k/ Solution1: 利用累计和 Time complexity: O(n2) Space complexity: O(n) Solution2: 移动subarray的起点和终点,计算两点之间的和 Time complexity: O(n2) Space complexit......