某次参加华为OD机考,其中抽中的一道题是输入一组坐标集合,然后输出可以组成正方形的个数以及能组成正方形的坐标组合,当时自己也是一筹莫展,竟然用四条相邻的边相等和相邻两条边的夹角为90度这样的数学建模来解决,结果花了很长时间硬是没解出来。现在回过头来继续刷一下这道算法题,发现其实它并不是那么难。下面我把自己对这道算法题的解题思路和代码重新整理了一遍。
不全,但好像没看到有更好的版本,刷前132题暂时凑合着用吧! 转载自:LeetCode Question Difficulty Distribution 1 Two Sum 2 5
点击上方蓝字,和我一起学技术。 链接 https://leetcode.com/problems/4sum/ 难度 Medium 描述 Given an array nums of n integer
Total Accepted: 99662 Total Submissions: 523759
OpenCV保存PNG图像底层调用的就是libpng库,简要说一下libPNG库的单独使用。 1.首先需要下载两个库,一个是libpng,一个是zlib libpng库下载地址:http://www
前几天手里的智能锁项目 , 收到产品的建议(命令)说 , 就是人脸识别成功的时候 , 不要只显示摄像头捕捉到的图像 , 要弄个酷炫一点的背景, 背景里图片中间有个圆圈, 人脸就放到圆圈里也就是类似这样。。
看到安比实验室有篇文章在说《警惕!Solidity缺陷易使合约状态失控》的问题,原文链接可以在参考链接中获取。
R.2: In interfaces, use raw pointers to denote individual objects (only)
UEF、VEH、VCH异常处理函数定义(UEF和VEH、VCH的函数类型名不一样,但是参数是一样的):
概念:two pointers广义上概念就是利用问题本身与序列的特性,利用下标i、j对序列进行扫描,以较低的复杂度来解决问题,其实也不太像是一种算法,说来可以看做是一种编程技巧,一种思想比较适合。
我想很多人曾经遇到过像 int * (*fp1) (int) [10] 这样的声明;或者你无法理解的类似的东西?本文将教您解释如此复杂的 C/C++声明,包括使用打字、const 和函数指头。
The rules in the following section also work for other kinds of third-party and custom smart pointers and are very useful for diagnosing common smart pointer errors that cause performance and correctness problems. You want the rules to work on all the smart pointers you use.
但凡刷过leetcode或者参加面试,大抵都遇到过如下这种问题:删除单链表中value为给定值的所有节点。
参赛人数:2人 准备用具:一副扑克 规则: 扑克牌A,2,3,4,5,6,7,8,9,10,J,Q,K分别代表数字1,2,3,4,5,6,7,8,9,10,11,12,13. 每人轮流取扑克牌,目的是凑成“和”为21点,谁先凑成21谁就胜利。如果没有人凑到21点,就规定最接近21点且小于21点的一方为胜者,每人均可要数次牌,需要注意的是,如果点数和超出21点,就是爆掉了(输了)
从开始这个Github已经有将近两年时间, 很高兴这个repo可以帮到有需要的人. 我一直认为, 知识本身是无价的, 因此每逢闲暇, 我就会来维护这个repo, 给刷题的朋友们一些我的想法和见解. 下面来简单介绍一下这个repo:
A circular buffer, cyclic buffer or ring buffer is a data structure that uses a single, fixed-size buffer as if it were connected end-to-end. This structure lends itself easily to buffering data streams.
You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the following definition:
<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> <title>jQuery可拖动控制进度条</title> <style type="text/css"> .demo {
Database Indexing Concepts Indexing mechanisms used to speed up access to desired data Search Key An attribute or a set of attributes used to look up records in a file An index file consists of records (called index entries) of the form search key - pointe
Shenandoah面向low-pause-time的垃圾收集器,它的GC cycle主要有
To avoid the crashes and data corruption that can result from the use of such a dangling pointer.
时间是一个比较抽象的概念,是物质运动、变化的持续性、顺序性的表现。正因为人们需要研究物质的运动,就必须通过一个中介者来认识和度量时间,这个中介者就是计时器,从古代的沙漏、铜壶滴漏到近代的机械钟表,再到现代的电子钟表。我今天就通过编写一个显示机械钟表时间界面的程序(界面后面的发条传动装置啥的不在今天讨论的范围)来阐述其中的数学原理。
Using std::unique_ptr is the simplest way to avoid leaks. It is reliable, it makes the type system do much of the work to validate ownership safety, it increases readability, and it has zero or near zero run-time cost.
Binbloom是一款针对二进制源码的固件分析软件,该工具旨在帮助广大研究人员分析固件的二进制源码,并自动化判断目标固件中的某些功能特性。该工具兼容所有常见的系统架构,因为该工具只会对目标固件进行简单的特性统计。
There is nothing (in the C++ standard or in most code) to say otherwise and most raw pointers are non-owning. We want owning pointers identified so that we can reliably and efficiently delete the objects pointed to by owning pointers.
在 Swift 5.5 中,Actors 是一项新的语言特性,旨在帮助开发人员更容易地编写并发代码。Actors 可以让多个任务同时访问一个对象,同时保证线程安全和数据完整性。本文将详细介绍 Swift 中的 Actors,包括如何定义、如何使用以及如何避免数据竞争。
https://github.com/gongluck/FFmpeg4.0-study/tree/master/Cff
1. DMP代码编写 包含头文件和引用Lib库
For implementing self-ownership, smart pointers must carefu
Golang 是谷歌在 09 年开源的一个静态类型、支持 GC、支持函数式的编程语言,由于对多线程编程语法级别的支持,在云计算时代大放异彩。Go 中有很多令人会心一笑的设计,也有很多遭人不时诟病的旮旯,但总体来说, Go 是一门令人眼前一亮的语言,很多设计引人思考、很多取舍令人触动,从这方面来说,我觉得 Go 值得一学。
This profile makes it easier to construct code that operates within the bounds of allocated blocks of memory. It does so by focusing on removing the primary sources of bounds violations: pointer arithmetic and array indexing. One of the core features of this profile is to restrict pointers to only refer to single objects, not arrays.
|270|Missing Number.java|Easy|Java|[Array, Bit Manipulation, Math]|| |271|LRU Cache.java|Hard|Java|[Design, Hash Table, Linked List]|| |272|Remove Duplicates from Sorted Array.java|Easy|Java|[Array, Two Pointers]|| |273|Remove Duplicates from Sorted Array II.java|Medium|Java|[Array, Two Pointers]|| |274|Remove Duplicates from Sorted List.java|Easy|Java|[Linked List]|| |275|Remove Duplicates from Sorted List II.java|Medium|Java|[Linked List]|| |276|QuickSort.java|Medium|Java|[Quick Sort, Sort]|| |277|MergeSort.java|Medium|Java|[Merge Sort, Sort]|| |278|Longest Word in Dictionary.java|Easy|Java|[Hash Table, Trie]|| |279|Binary Tree Level Order Traversal.java|Medium|Java|[BFS, DFS, Tree]|| |280|Binary Tree Level Order Traversal II.java|Medium|Java|[BFS, Tree]|| |281|Binary Tree Longest Consecutive Sequence II.java|Medium|Java|[DFS, Divide and Conquer, Double Recursive, Tree]|| |282|Binary Tree Maximum Path Sum.java|Hard|Java|[DFS, DP, Tree, Tree DP]|| |283|Path Sum.java|Easy|Java|[DFS, Tree]|| |284|Path Sum II.java|Easy|Java|[Backtracking, DFS, Tree]|| |285|Path Sum III.java|Easy|Java|[DFS, Double Recursive, Tree]|| |286|Rotate String.java|Easy|Java|[String]|| |287|Combinations.java|Medium|Java|[Backtracking, Combination, DFS]|| |288|Combination Sum IV.java|Medium|Java|[Array, Backpack DP, DP]|| |289|Binary Tree Right Side View.java|Medium|Java|[BFS, DFS, Tree]|| |290|Binary Tree Maximum Path Sum II.java|Medium|Java|[DFS, Tree]|| |291|Rotate List.java|Medium|Java|[Linked List, Two Pointers]|| |292|Basic Calculator.java|Hard|Java|[Binary Tree, Expression Tree, Math, Minimum Binary Tree, Stack]|| |293|Longest Consecutive Sequence.java|Hard|Java|[Array, Hash Table, Union Find]|| |294|Binary Tree Longest Consecutive Sequence.java|Medium|Java|[DFS, Divide and Conquer, Tree]|| |295|Number of Connected Components in an Undirected Graph.java|Medium|Java|[BFS, DFS, Graph, Union Find]|| |296|Next Closest Time.java|Medium|Java|[Basic Implementation, Enumeration, String]|| |297|Serialize and Deseriali
c99中新增加了一个类型定义,就是restrict。 restrict的定义是It can be applied only to pointers, and it indicates that a pointer is the sole initial means of accessing a data object. 我不知道确切应该怎么翻译,大意是restrict只对指针有用,它声明一个指针是唯一初始化访问一个数据对象。 比如,按照书上的例子,
Write a program to find the node at which the intersection of two singly linked lists begins.
Hash pointers can be used to build a linked list, which is also called a blockchain.
spew是一个更友好的变量打印工具,github.com/davecgh/go-spew,它能打印指针指向的内容,避免直接打印的时候打印出来的是指针地址的问题,同时能够检测结构体中存在的环,解决了json序列化打印的时候不能打印环的问题,它提供了很多接口,可以打印到文件、json、和标准输出,逻辑都差不多,我们详细分析下打印到标准输出逻辑的实现。
Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any Callable target -- functions, lambda expressions, bind expressions, or other function objects, as well as pointers to member functions and pointers to data members.
今天给大家聊一个非常经典也非常简单的算法,学会了这个算法不说能够纵横leetcode,但可以解决非常多的问题。并且很多其他的算法也用到了类似的思想,非常有借鉴意义。
Accepting a smart pointer to a widget is wrong if the function just needs the widget itself. It should be able to accept any widget object, not just ones whose lifetimes are managed by a particular kind of smart pointer. A function that does not manipulate lifetime should take raw pointers or references instead.
在之前的文章中介绍了 stb_image 图像库,还顺带提到了 libpng 和 libjpeg ,这篇文章就是介绍如何在 Android 平台上用 CMake 编译 libpng 动态库以及 libpng 使用实践。
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Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL.
Follow up for problem “Populating Next Right Pointers in Each Node“.
Total Accepted: 18934 Total Submissions: 62031 My Submissions
There is nothing (in the C++ standard or in most code) to say otherwise and most raw references are non-owning. We want owners identified so that we can reliably and efficiently delete the objects pointed to by owning pointers.
ES.87: Don't add redundant == or != to conditions
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