LeetCode力扣 658. 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 ...
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 value sum = 0, occurr...
Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:nums = [1,1,1], k = 2 Output: 2 Note: The length of the array is in range [1, 20,000]. The range of numbers in the array is [...
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:...
The problem "Two Sum" requires finding two numbers in an integer array such that their sum equals a specified target number. You need to return the indices of these two numbers, where indices start from 0. The indices of the two numbers cannot be the same, and there is exactly one solut...
[LeetCode] 560. Subarray Sum Equals K Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:nums = [1,1,1], k = 2 Output: 2 1. 2....
Leetcode 560. Subarray Sum Equals K,题目链接:SubarraySumEqualsK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
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 /\ 48 //\ 11134 /\/\ ...
1. Description Subarray Sum Equals K 2. Solution 解析:Version 1,使用前缀和来解决,遍历数组,求前缀和,统计前缀和的次数并保存到字典中,当碰到差值在字典中存在时,则意味着当前数组减去之前的前缀和数组等于k,将次数加到count中,更新前缀和的次数。注意,假设第一个数就等于k,此时数组中没有差值0的次数,因此...
Explanation: The final subarray needs to be non-empty. You can't choose [-1] and delete -1 from it, then get an empty subarray to make the sum equals to 0. Constraints: 1 <= arr.length <= 10^5 -104 <= arr[i] <= 10^4 ...