you want to choose a subarray and optionally delete one element from it so that there is still at least one element left and the sum of the remaining elements is maximum possible.
---> i - map.get(sum - k)在这个例子里就是5-2 代码如下: public int maxSubArrayLen(int[] nums, int k) { int sum = 0, max = 0; HashMap<Integer, Integer> map = new HashMap<Integer, Integer>(); for (int i = 0; i < nums.length; i++) { sum = sum + nums[i]; if ...
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...
二刷的时候发现直接用hashmap记录unique的前缀和就可以了,不用再用一个额外数组记录前缀和。 时间O(n) 空间O(n) Java实现 1classSolution {2publicintmaxSubArrayLen(int[] nums,intk) {3HashMap<Integer, Integer> map =newHashMap<>();4map.put(0, -1);5intsum = 0;6intres = 0;7for(inti = ...
[leetcode]53. Maximum Subarray 最大连续子串python实现【medium】 http://blog.csdn.net/zl87758539/article/details/51676108 题目: Maximum Subarray Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, give......
leetcode || 53、Maximum Subarray problem: Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,1,−5,4], the...Leetcode 53:Maximum Subarray Given an integer array nums, ...
classSolution {public:intmaxSubArrayLen(vector<int>& nums,intk) {if(nums.empty())return0;intres =0; unordered_map<int, vector<int>>m; m[nums[0]].push_back(0); vector<int> sum =nums;for(inti =1; i < nums.size(); ++i) { ...
Explanation: The subarray[1, -1, 5, -2]sums to 3 and is the longest. 1. 1. 1. 首先计算出数组的前缀和,数组变为[1, 0, 5,3,6]。接着遍历这个前缀和的数组,用hashmap记录<prefix sum, i> -每个不同的前缀和和他们出现的位置。如果此时发现nums[i] - k在hashmap中,则res = Math.max(...
leetcode || 53、Maximum Subarray problem: Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,1,−5,4], the contiguous subarray [4,−1,2,1] has the largest sum = 6....
arr, partition the array into (contiguous) subarrays of lengthat mostk. After partitioning, each subarray has their values changed to become the maximum value of that subarray. Returnthe largest sum of the given array after partitioning. Test cases are generated so that the answer fits in a32...