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 ...
1. No element is deleted. This is equivalent with maximum subarray sum. 2. One element is deleted. We can reduce this to finding a maximum sum of two separated subarrays, endAt[i - 1] and startAt[i + 1], arr[i] is deleted. endAt[i - 1] is already computed in case 1. So we...
第一个例子是Leetcode 325 Maximum Size Subarray Sum Equals k. 付费题我完整复制一下题目。 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. Note:The sum of the entire nums array is guaranteed to fit...
Given a binary array arr[] and an integer target, return the number of non-empty subarrays with a sum equal to the target. Note: A subarray is the contiguous part of the array. Examples: Input: arr[] = [1, 0, 1, 0, 1], target = 2 Output: 4 Explanation: There are four subar...
4 years ago, # | 0 Observe that decreasing every element kk will also decrease the average by kk. Thus, if every element in the array is decreased by kk, then the answer is equal to the number of subarrays with an average (or equivalently sum) of 00. Consider the prefix sum array...
The second line of each test case contains a string consisting of ??? decimal digits, where the ???-th digit is equal to the value of ???. It is guaranteed that the sum of ??? over all test cases does not exceed 105. 题意: 问数组...
Special Permutations wisdompeak 200 0 21:03 【LeetCode】1043 Partition Array for Maximum Sum wisdompeak 254 0 11:19 【LeetCode】2831. Find the Longest Equal Subarray wisdompeak 189 2 36:12 【LeetCode】1918. Kth Smallest Subarray Sum wisdompeak 191 0 ...
The second line of each test case contains a string consisting of n decimal digits, where the i-th digit is equal to the value ofa i a_iai. It is guaranteed that the sum of n over all test cases does not exceed1 0 5 10^5105. ...
Hello Codeforces. Recently I faced a problem which I couldn't solve in an hour. It is as follows: Max Sum Subarray of atleast 2 numbers. Of course, for just max sum subarray it is Kadane's algorithm in O(n) time, however, I couldn't think of a way to solve for atleast 2 numb...
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