class Solution(object): def largestSumAfterKNegations(self, A, K): """ :type A: List[int] :type K: int :rtype: int """ have_zero = False negative = [] positive = [] for a in A: if a < 0: negative.append(a) elif a == 0: hav…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 小根堆 日期 题目地址:https://leetcode.com/problems/maximize-sum-of-array-after-k-negations/ 题目描述 Given an array A of integers, we must modify the array in the following way: we choose a…

题目如下: Given an array A of integers, we must modify the array in the following way: we choose an i and replace A[i]with -A[i], and we repeat this process K times in total.  (We may choose the same index i multiple times.) Return the largest possible s…

这道题是LeetCode里的第1005道题. 题目描述: 给定一个整数数组 A,我们只能用以下方法修改该数组:我们选择某个个索引 i 并将 A[i] 替换为 -A[i],然后总共重复这个过程 K 次.(我们可以多次选择同一个索引 i.) 以这种方式修改数组后,返回数组可能的最大和. 示例 1: 输入:A = [4,2,3], K = 1 输出:5 解释:选择索引 (1,) ,然后 A 变为 [4,-2,3]. 示例 2: 输入:A = [3,-1,0,2], K = 3 输出:6 解释:选择索引…

这是悦乐书的第376次更新,第403篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第237题(顺位题号是1005).给定一个整数数组A,我们必须按以下方式修改数组:我们选择一个i并用-A[i]替换A[i],重复这个过程K次.(我们可以多次选择相同的索引.) 以这种方式修改后,返回数组可能的最大总和.例如: 输入:A = [4,2,3], K = 1 输出:5 说明:选择索引(1,),A变为[4,-2,3]. 输入:A = [3,-1,0,2], K = 3 输出:6…

Given an array A of integers, we must modify the array in the following way: we choose an i and replace A[i] with -A[i], and we repeat this process K times in total.  (We may choose the same index i multiple times.) Return the largest possible sum of…

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 m…

整体上3个题都是求subarray,都是同一个思想,通过累加,然后判断和目标k值之间的关系,然后查看之前子数组的累加和. map的存储:560题是存储的当前的累加和与个数 561题是存储的当前累加和的余数与第一次出现这个余数的位置 325题存储的是当前累加和与第一次出现这个和的位置 其实561与325都是求的最长长度,那就一定要存储的是第一次出现满足要求的位置,中间可能还出现这种满足要求的情况,但都不能进行存储 560. Subarray Sum Equals K 求和为k的连续子数组的个数 h…

leetcode - 40. Combination Sum II - Medium descrition Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combinat…

leetcode - 39. Combination Sum - Medium descrition Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from…

原题链接在这里:https://leetcode.com/problems/maximum-sum-of-3-non-overlapping-subarrays/ 题目: In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to maximize the sum…

In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to maximize the sum of all 3*k entries. Return the result as a list of indices representing the starting p…

Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers. Ensure that numbers within the set are sorted in ascending order. Example 1…

LeetCode 1 Two Sum 解题报告 偶然间听见leetcode这个平台,这里面题量也不是很多200多题,打算平时有空在研究生期间就刷完,跟跟多的练习算法的人进行交流思想,一定的ACM算法积累可以对以后在对算法中优化带来好处.Ok,今天是我做的第一题Add Two Sum. 题目要求 Given an array of integers, find two numbers such that they add up to a specific target number. The fu…

一. 题目 1. Two Sum II Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the ta…

一. 题目 1. Two SumTotal Accepted: 241484 Total Submissions: 1005339 Difficulty: Easy Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solutio…

In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to maximize the sum of all 3*k entries. Return the result as a list of indices representing the starting p…

原题链接在这里:https://leetcode.com/problems/continuous-subarray-sum/description/ 题目: Given a list of non-negative numbers and a target integer k, write a function to check if the array has a continuous subarray of size at least 2 that sums up to the multip…

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / \ 3 6 / \ \ 2 4 7 Target = 9 Output: TrueExample 2: Input: 5 / \ 3 6 / \ \ 2 4…

题目: Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where inde…

好久没有刷LeetCode了,准备重拾并坚持下去,每天刷个两小时.今天算是开始的第一天,不过出师不利,在一道很简单的题目上墨迹半天.不过还好,现在踩过的坑,应该都不会白踩,这些可能都是以后程序员路上稳固的基石哦.任何优秀的程序员不都是这样过来的嘛,坚持就好. 注意:大家练习时同样要注意代码的风格,这一点推荐上lintcode测试一下,练习几次风格自然就好了. 下面开始写第一题的解题过程(包括写错的过程) 思路一:累加数组 1. 求出数组的累加数组(循环遍历,每一项等于前一项的和)2. k个数的和…

A sorted list A contains 1, plus some number of primes.  Then, for every p < q in the list, we consider the fraction p/q. What is the K-th smallest fraction considered?  Return your answer as an array of ints, where answer[0] = pand answer[1] = q. Ex…

Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example: Given nums = [2, 7, 11, 15]…

Design and implement a TwoSum class. It should support the following operations:add and find. add - Add the number to an internal data structure.find - Find if there exists any pair of numbers which sum is equal to the value. For example,add(1); add(…

Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers. Example 1: Input: k = 3, n = 7 Output: [[1,2,4]] Example 2: Input: k = 3, n…

Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nums = [-2, 0, 3, -5, 2, -1] sumRange(0, 2) -> 1 sumRange(2, 5) -> -1 sumRange(0, 5) -> -3 Note: You may assume that the array do…

Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. Example: nums = [1, 2, 3] target = 4 The possible combination ways are: (1, 1, 1, 1) (1, 1, 2) (1,…

LeetCode:Search in Rotated Sorted Array Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target value to search. If found in the array return its index, other…

LeetCode:Remove Duplicates from Sorted Array Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this in place with constan…

LeetCode one Two Sum (JAVA) 简介:给定一个数组和目标值,寻找数组中符合求和条件的两个数. 问题详解: 给定一个数据类型为int的数组,一个数据类型为int的目标值target,要求是在数组中寻求两个数字,使得两个数求和的值等于给定的target,要求以数组返回符合条件的索引. 技巧:可以假设数组中没有重复元素,因为我们只返回一个符合条件的数组,所以数组中只需要一个符合要求的数字就可以了. 举例: 给定数组 nums={5,8,7,2,11},target= 10, 因…