problem 724. Find Pivot Index 题意:先求出数组的总和,然后维护一个当前数组之和curSum,然后对于遍历到的位置,用总和减去当前数字,看得到的结果是否是curSum的两倍,是的话,那么当前位置就是中枢点,返回即可:否则就将当前数字加到curSum中继续遍历,遍历结束后还没返回,说明没有中枢点,返回-1即可. solution: 注意,不管有几种方式,最后的结果都是从最左边开始的那个结果,那么我们就直接从最左边开始计算,返回第一个满足条件的即可. class Solu…

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 先求和,再遍历 日期 题目地址:https://leetcode.com/problems/find-pivot-index/description/ 题目描述 Given an array of integers nums, write a method that returns the "pivot" index of this arr…

转自http://blog.itpub.net/22664653/viewspace-1210844/  [MySQL]性能优化之 Index Condition Pushdown2014-07-06 21:25:57 分类: MySQL 一 概念介绍    Index Condition Pushdown (ICP)是MySQL 5.6 版本中的新特性,是一种在存储引擎层使用索引过滤数据的一种优化方式.a 当关闭ICP时,index 仅仅是data access 的一种访问方式,存储引擎通过索…

leetcode 724. Find Pivot Index 题目描述:在数组中找到一个值,使得该值两边所有值的和相等.如果值存在,返回该值的索引,否则返回-1 思路:遍历两遍数组,第一遍求出数组的和,第二遍开始,保存左边所有的值的和,当左边值的和的2倍加上当前值等于数组和时,就是要找的索引.时间复杂度为o(n),空间复杂度为o(1). class Solution(object): def pivotIndex(self, nums): """ :type nums: Li…

[编程语言]C# [数据库]MySQL [控件]GridView [问题描述]GridView控件中自带[删除],[编辑],[选择],三个按钮[编辑],[选择]正常使用,但是在使用删除时,却报错Parameter index is out of range 报错页面截图如下: [代码] aspx <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="icode.aspx.cs"…

Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of the numbers to the left of the index is equal to the sum of the numbers to the right of the ind…

Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of the numbers to the left of the index is equal to the sum of the numbers to the right of the ind…

［抄题］: Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of the numbers to the left of the index is equal to the sum of the numbers to the right of t…

problem 852. Peak Index in a Mountain Array solution1: class Solution { public: int peakIndexInMountainArray(vector<int>& A) { return max_element(A.begin(), A.end())-A.begin(); } }; solution2: class Solution { public: int peakIndexInMountainArra…

problem 599. Minimum Index Sum of Two Lists 题意:给出两个字符串数组,找到坐标位置之和最小的相同的字符串. 计算两个的坐标之和,如果与最小坐标和sum相同,那么将这个字符串加入结果res中,如果比sum小,那么sum更新为这个较小值,然后将结果res清空并加入这个字符串. solution: class Solution { public: vector<string> findRestaurant(vector<string>&…

lucene在doc.add(new Field("content",curArt.getContent(),Field.Store.NO,Field.Index.TOKENIZED)); Field有两个属性可选:存储和索引. 通过存储属性你可以控制是否对这个Field进行存储: 通过索引属性你可以控制是否对该Field进行索引. 事实上对这两个属性的正确组合很重要. Field.Index Field.Store 说明 TOKENIZED(分词) YES 被分词索引且存储 TOKE…

From this blog, we start to talk about the index in mongo Database, which is similar to the traditional database. Generally speaking, if the index need to be created in the traditional database, so does MongoDB.  In MongoDB ,the field '_id ' has been…

前言 新到手一块板子,程序编译成功之后,运行出现错误,不能连接到摄像头. 问题 VIDEOIO ERROR: V4L: index is not correct! Unable to connect to camera 查询系统摄像头接口 ubuntu@myimx6ek200:~/build$ ls /dev/vi* /dev/video0 /dev/video1 /dev/video16 /dev/video17 /dev/video18 /dev/video19 /dev/video2 /d…

Spring接受前台的数据超过256出现例如以下异常: org.springframework.beans.InvalidPropertyException: Invalid property 'specificationValues[256]' of bean class [com.sencloud.entity.Specification]: Index of out of bounds in property path 'specificationValues[256]'; nested…

In this blog, we will talk about another the index which was called "The embedded ". First we init 1w the records as follows: watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc3hiMDg0MTkwMTExNg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve…

一 概念介绍    Index Condition Pushdown (ICP)是MySQL 5.6 版本中的新特性,是一种在存储引擎层使用索引过滤数据的一种优化方式.a 当关闭ICP时,index 仅仅是data access 的一种访问方式,存储引擎通过索引回表获取的数据会传递到MySQL Server 层进行where条件过滤.b 当打开ICP时,如果部分where条件能使用索引中的字段,MySQL Server 会把这部分下推到引擎层,可以利用index过滤的where条件在存储引擎层进…

problem 1160. Find Words That Can Be Formed by Characters solution class Solution { public: int countCharacters(vector<string>& words, string chars) { ; unordered_map<char, int> charmap; for(auto ch:chars) charmap[ch]++; for(auto word:word…

724. 寻找数组的中心下标 知识点:数组:前缀和: 题目描述 给你一个整数数组 nums ,请计算数组的 中心下标 . 数组 中心下标 是数组的一个下标,其左侧所有元素相加的和等于右侧所有元素相加的和. 如果中心下标位于数组最左端,那么左侧数之和视为 0 ,因为在下标的左侧不存在元素.这一点对于中心下标位于数组最右端同样适用. 如果数组有多个中心下标,应该返回 最靠近左边 的那一个.如果数组不存在中心下标,返回 -1 . 示例 输入:nums = [1, 7, 3, 6, 5, 6] 输出:3…

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 每次遍历索引 字典保存索引 蓄水池抽样 日期 题目地址:https://leetcode.com/problems/random-pick-index/description/ 题目描述 Given an array of integers with possible duplicates, randomly output the index of…

problem 1021. Remove Outermost Parentheses 参考 1. Leetcode_easy_1021. Remove Outermost Parentheses; 完…

problem 1022. Sum of Root To Leaf Binary Numbers 参考 1. Leetcode_easy_1022. Sum of Root To Leaf Binary Numbers; 完…

problem 1025. Divisor Game 参考 1. Leetcode_easy_1025. Divisor Game; 完…

problem 1029. Two City Scheduling 参考 1. Leetcode_easy_1029. Two City Scheduling; 完…

problem 1030. Matrix Cells in Distance Order 参考 1. Leetcode_easy_1030. Matrix Cells in Distance Order; 完…

problem 1033. Moving Stones Until Consecutive 参考 1. Leetcode_easy_1033. Moving Stones Until Consecutive; 完…

problem 1037. Valid Boomerang 参考 1. Leetcode_easy_1037. Valid Boomerang; 完…

problem 1042. Flower Planting With No Adjacent 参考 1. Leetcode_easy_1042. Flower Planting With No Adjacent; 完…

problem 1046. Last Stone Weight 参考 1. Leetcode_easy_1046. Last Stone Weight; 完…

problem 1047. Remove All Adjacent Duplicates In String 参考 1. Leetcode_easy_1047. Remove All Adjacent Duplicates In String; 完…

problem 1051. Height Checker solution class Solution { public: int heightChecker(vector<int>& heights) { vector<int> orders = heights; sort(orders.begin(), orders.end()); ; ; i<heights.size(); i++) { if(heights[i]!=orders[i]) res++; } r…