维护前缀数组sums[],我们维护一个记录前缀和的map,map[x]表示前缀和是x距离当前i最近的下标。 那么状态转移方程就是dp[i] = max(dp[i-1], dp[map[sums[i]-target]]+1) class Solution { public:intdp[100005];intsum[100005];map<int,int> m;intmaxNonOverlapping(vector<int>& nums,inttarget) { ...
Leetcode: Subarray Sum Equals K\\\Binary Subarrays With Sum Problem 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......
第一种是prefix sum + 双指针。 例如Minimum Size Subarray Sum - LeetCode: Given an array of n positive integers and a positive integers, find the minimal length of a contiguous subarray of which the sum ≥s. If there isn't one, return 0 instead. 用O(N)时间得到一个prefix sum array,可...
问题描述: Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right whichminimizes the sum of all numbers along its path. Note: You can only move either down or right ... leetcode之3Sum Closest 问题 ...
Since the prefix sum array is monotonically increasing, we can use binary search to find the target index. But the corner case really takes a while to deal with. classSolution{publicintminSubArrayLen(ints,int[] nums){intN=nums.length;if(N ==0)return0;for(inti=1; i < N; ++i) nums...
leetcode 209. Minimum Size Subarray Sum using sliding window And try to Using prefix sum method, the rightmost index with value <= current_sum - s must be found. Since the prefix sum array is monotonically increasing, we can use binary s......
2.Smallest Subarray with a given sum(easy) 2.1 问题描述 2.2 解决方法 2.3 代码 3.课后回顾 4.参考链接 sliding window pattern 1.原理描述 滑动窗口模式(sliding window pattern)是用于在给定数组或链表的特定窗口大小上执行所需的操作,比如寻找包含所有 1 的最长子数组。从第一个元素开始滑动窗口并逐个元素地...
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. this is a really easy undetstanding problem. and the follow up is do it in O(n) time. ...
[LeetCode] 325. Maximum Size Subarray Sum Equals k Given an arraynumsand a target valuek, find the maximum length of a subarray that sums tok. If there isn't one, return 0 instead. Note: The sum of the entirenumsarray is guaranteed to fit within the 32-bit signed integer range....
A set of practice note, solution, complexity analysis and test bench to leetcode problem set - leetcode/CountSubArrayFixBound.drawio at b58bcceb0ea27d0756ad72fb6a64b3b547fae221 · brianchiang-tw/leetcode