Maximum Subarray Sum 题意 给你一个大小为N的数组和另外一个整数M。你的目标是找到每个子数组的和对M取余数的最大值。子数组是指原数组的任意连续元素的子集。 分析 参考 求出前缀和,问题变成了O(n*n)复杂度的问题,但是仍然不能解决问题。 设prefix为前缀和,设i < j,一般都是通过算sum = prefix[j] -...
Given an arraynumsand a target valuek, find the maximum length of a subarray that sums tok. If there isn't one, return 0 instead. Example 1: Givennums=[1, -1, 5, -2, 3],k=3, return4. (because the subarray[1, -1, 5, -2]sums to 3 and is the longest) Example 2: Given...
So I change the format of the sub problem into something like:maxSubArray(int A[], int i), which means the maxSubArray for A[0:i ] which must has A[i] as the end element. Note that now the sub problem's format is less flexible and less powerful than the previous one because the...
907. Sum of Subarray Minimums # 题目# Given an array of integers A, find the sum of min(B), where B ranges over every (contiguous) subarray of A. Since the answer may be large, return the answer modulo 10^9 + 7. Example 1: Input: [3,1,2,4] Output: 17 Explanation: Subarray...
53. Maximum Subarray* (最大子序和) https://leetcode.com/problems/maximum-subarray/ 题目描述 Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and returnits sum. ...
Given acircular arrayCof integers represented byA, find the maximum possible sum of a non-empty subarray ofC. Here, acircular arraymeans the end of the array connects to the beginning of the array. (Formally,C[i] = A[i]when0 <= i < A.length, andC[i+A.length] = C[i]wheni >...
Special thanks to@Freezenfor adding this problem and creating all test cases. 这道题给定了我们一个数字,让我们求子数组之和大于等于给定值的最小长度,跟之前那道Maximum Subarray 最大子数组有些类似,并且题目中要求我们实现O(n)和O(nlgn)两种解法,那么我们先来看O(n)的解法,我们需要定义两个指针left和ri...
LeetCode - The World's Leading Online Programming Learning Platformleetcode.com/problems/maximum-gcd-sum-of-a-subarray/description/ 简单介绍一下题目大意,更详细的描述可以见链接中的原题描述及样例数据: 给定一个长度为n的正整数数组nums。对于nums的任意一个子数组(连续、非空的一段),定义s为子数组...
Leetcode 325: Maximum Size Subarray Sum Equals k 分类:Hash 难度:M 描述:给了一个数组,一个数字k,问数组中子序列中,相加等于k的最长子序列的长度。 链接: Maximum Size Subarray Sum Equals k. 思路: 使用一个字典,建立到当前位置的元素累加和与元素位置的一个映射,即dict:sum -> i。然后在寻...猜...
二、Maximum Sum Circular Subarray 问题描述: 问题求解: 唯一的边界条件是如果全部为负数,那么minsubarray = sum,这个时候直接返回max即可。 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public int maxSubarraySumCircular(int[] A) { int n = A.length; int sum = 0; for (int...