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2. 参考Prefix Sum & Dictionary Time and Space O(n) for -- Find a number of continuous subarrays/submatrices/tree paths that sum to targetT: O(n), S: O(n) classSolution:defsubarraySum(self, nums: List[int], target: int) ->int: count, curSum, d=0, 0, collections.Counter()forn...
Leetcode 218 The Skyline Problem Leetcode 480. Sliding Window Median (这个题用TreeMap超级方便) Leetcode 318 Count of Smaller Numbers After Self (这个题线段树、二分索引树、TreeMap都可以) 动态规划(Dynamic Programming) 基础知识:这里指的是用for循环方式的动态规划,非Memoization Search方式。DP可以在多...
解法1:Minimum Window Substring这题里的解法可以用到本题,只要稍动脑筋就知道如何转化了。 // Solution 1: Minimum Window Substring The solution of that problem can be applied here, with just a little trick to convert the problem, we're good. 代码1 //Code 1 633 Sum of Square Numbers // #6...
leetcode求和问题描述(K sum problem): K sum的求和问题一般是这样子描述的:给你一组N个数字(比如 vector<int> num), 然后给你一个常数(比如 int target) ,我们的goal是在这一堆数里面找到K个数字,使得这K个数字的和等于target。 注意事项(constraints): ...
307.Range-Sum-Query-Mutable (H-) 1526.Minimum-Number-of-Increments-on-Subarrays-to-Form-a-Target-Array (H-) 1649.Create-Sorted-Array-through-Instructions (H-) 1157.Online-Majority-Element-In-Subarray (H) 370.Range-Addition (H) 218.The-Skyline-Problem (H+) 699.Falling-Squares (H) 715...
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1. 【解答】checkBalanced 方法用来递归检查是否平衡的,返回树高度,偷了个巧,如果发现不平衡抛出 TreeUnbalancedException 异常: 代码语言:javasc...
整个数组的和(sum)是可以很容易得到的,那么分成两个部分,每个部分的和(sum/2)也就可以很容易得到了。于是这道题就变成了,能不能从数组中找出一些数,使之和为 sum/2?搜索求解即可。 求解期间做一点小优化,创建一个<index, <target, partitionable>> 这样的结构,表示源数组的下标 index 开始往后到底的这一段...
Word Break Problem -https://leetcode.com/problems/word-break/ Combination Sum -https://leetcode.com/problems/combination-sum-iv/ House Robber -https://leetcode.com/problems/house-robber/ House Robber II -https://leetcode.com/problems/house-robber-ii/ ...
0216 Combination Sum III Go 56.5% Medium 0217 Contains Duplicate Go 56.0% Easy 0218 The Skyline Problem Go 34.5% Hard 0219 Contains Duplicate II Go 37.7% Easy 0220 Contains Duplicate III Go 20.9% Medium 0221 Maximal Square 37.7% Medium 0222 Count Complete Tree Nodes Go 46.7% Medium...