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
Can you solve this real interview question? Subarray Sum Equals K - Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. A subarray is a contiguous non-empty sequence of elements within an array.
int subarraySum(vector[span style="color: rgba(0, 0, 255, 1)">int int res = 0, sum = 0, n = nums.size(); unordered_map[span style="color: rgba(0, 0, 255, 1)">int, int for (int i = 0; i < n; ++i) { sum += nums【i】; res += m【sum - k】; ++m【sum】;...
解法一:利用sum之间的差暴力搜索 classSolution {publicintsubarraySum(int[] nums,intk) {if(nums ==null|| nums.length == 0)return0;intlen =nums.length;int[] sum =newint[len+1];for(inti=0; i<len; i++) sum[i+1] = sum[i] +nums[i];intcnt = 0;for(inti=0; i<len; i++) ...
这题可以利用HashMap,把出现过的sum 当作key 存入, 把这个sum 出现过的次数 当作value 存入。 遍历nums array,一直更新sum,然后去map 里找有没有 sum - k,有的话说明 sum - k 是一个旧的sum,之前出现过。换句话说,新的sum - 旧的sum = k,说明 新的sum 减去 旧的sum,剩下的那一段的 和 等于k,...
LeetCode力扣 560. 和为 K 的子数组 Subarray Sum Equals KEdward留学求职 立即播放 打开App,流畅又高清100+个相关视频 更多438 -- 10:52 App 4 新手一天 100 道力扣题挑战|树的最大深度 双序 DFS 460 -- 10:41 App 1 新手一天100道力扣题挑战|树的最大深度 先序BFS 90 -- 7:22 App LeetCode...
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 ...
class Solution { public: int subarraySum(vector<int>& nums, int k) { unordered_map<int, int> mp; mp[0] = 1; int n = nums.size(), sum = 0, res = 0; for(int i = 0; i < n; ++i) { sum += nums[i]; if(mp.count(sum - k) != 0) res += mp[sum - k]; mp[su...
[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......
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,所以我们可以考虑对前缀和的方式进行优化,我们前缀...