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Given an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right 阅读全文
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Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, convert it to the simpl 阅读全文
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Given a non-negative integer x, return the square root of x rounded down to the nearest integer. The returned integer should be non-negative as well. 阅读全文
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Given two strings word1 and word2, return the minimum number of operations required to convert word1 to word2. You have the following three operations 阅读全文
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Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0's. You must do it in place. Example 1: Input: matrix = [[ 阅读全文
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Given an array nums with n objects colored red, white, or blue, sort them in-place so that objects of the same color are adjacent, with the colors in 阅读全文
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Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicat 阅读全文
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Download CMake 2.8.12Extract the file, and run "./bootstrap", then "make", then "sudo make install"Add some dependencies, run "sudo apt-get install bu... 阅读全文
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Download OpenCV 2.4.10Download CMake 2.8Open CMake and choose the source code directory and build binary directoryThen click "Configure", and "Generat... 阅读全文
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Given two integers n and k, return all possible combinations of k numbers chosen from the range [1, n]. You may return the answer in any order. Exampl 阅读全文
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Given an m x n grid of characters board and a string word, return true if word exists in the grid. The word can be constructed from letters of sequent 阅读全文
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有时候在项目中我们需要检测当前连接在机子上的摄像头的数量，可以通过下面的代码实现，其中连接摄像头的最大数量maxCamNum可以任意修改：/** * Count current camera number */int countCamera() { int maxCamNum = 5; ... 阅读全文
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Add in the system Path:C:\opencv\build\x86\vc10\bin;Project->Project Property->Configuration Properties->VC++Directories ->Include Directories:C:\open... 阅读全文
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Qt项目在打包发布之后都需要有个个性的程序图标和窗口图标，这样会使程序更加美观大方，下面我们分别来看如何给程序和窗口分别添加图标。我们需要两种格式的图片，一种是.ico的，用来给程序添加图标，一种是.bmp或是.png的，用来给窗口添加图标。- 程序添加图标如果使用的Qt Creator，那么用记事... 阅读全文
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Given an integer array nums sorted in non-decreasing order, remove some duplicates in-place such that each unique element appears at most twice. The r 阅读全文
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Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. The relati 阅读全文
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Download CMake 2.8.2Download OpenCV 2.4.11Download Qt 5.4Highly improtant note: The installation directory should not contain any space or non-English... 阅读全文
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There is an integer array nums sorted in non-decreasing order (not necessarily with distinct values). Before being passed to your function, nums is ro 阅读全文
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There is an integer array nums sorted in ascending order (with distinct values). Prior to being passed to your function, nums is possibly rotated at a 阅读全文
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Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit 阅读全文
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You are given an m x n integer matrix matrix with the following two properties: Each row is sorted in non-decreasing order. The first integer of each 阅读全文
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Given a rows x cols binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area. Example 1: Input: matri 阅读全文
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Given an array of integers heights representing the histogram's bar height where the width of each bar is 1, return the area of the largest rectangle 阅读全文
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Reverse bits of a given 32 bits unsigned integer. Example 1: Input: 00000010100101000001111010011100 Output: 00111001011110000010100101000000 Explanat 阅读全文
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Given the head of a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should p 阅读全文
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We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. If the length of the string is > 1 阅读全文
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An n-bit gray code sequence is a sequence of 2n integers where: Every integer is in the inclusive range [0, 2n - 1], The first integer is 0, An intege 阅读全文
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以下转换代码摘自维基百科 Wikipedia：/* The purpose of this function is to convert an unsigned binary number to reflected binary Gray code. Th... 阅读全文
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C++中的stringstream是专门用来处理字符串流的，可以按顺序将string或int都拼接起来，而不用把int转换为string格式，使用方法如下：#include #include #include stringstream strstream;std::string s;std::str... 阅读全文
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A message containing letters from A-Z is being encoded to numbers using the following mapping: Given a non-empty string containing only digits, determ 阅读全文
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这三种数据类型在实际运用中经常需要互相转换，那么这里小结下它们之间的转换方法：- Qstring & stringQt中封装的类十分强大，其成员函数数量之多比STD有过之而无不及，许多程序员抱怨Qt非要整个自己的QTD，为啥不直接支持STD，但是我想说某些时候QTD完全可以替代STD，就算不想完全替... 阅读全文
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Given a collection of integers that might contain duplicates, S, return all possible subsets. Note: Elements in a subset must be in non-descending ord 阅读全文
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Qt中QComboBox 和 QSpinBox 是两个很常用的空间，QComboBox 是下拉菜单，而 QSpinBox 是调参数的神器，所以它们的用法十分必要熟练掌握。首先来看 QComboBox，这个下拉菜单中的值可以在UI Designer中都设定好，位于第一个位置的就是默认值，也就是程序启动... 阅读全文
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Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Retu 阅读全文
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Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Out 阅读全文
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Given a string containing only digits, restore it by returning all possible valid IP address combinations. Example: Input: "25525511135" Output: ["255 阅读全文
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Qt中的QDialog类是用来生成对话框的类，QFileDialog 类是QDialog的衍生类，主要用来生成打开文件，或是打开文件目录的对话框，或者是保存文件的对话框，下面我们一一来看代码：1. Load File Dialog/** * Button event for Load File bu... 阅读全文
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Qt中QCheckBox的按键响应如下，其中checkbox为对象名：void YourClass::on_checkbox_toggled(bool state) { // Do something here} 阅读全文
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Qt中的QTabWiget 类提供了一个标签控件，但是这个控件默认初始化的颜色是白色，和原窗口的颜色不同，看起来非常的违和，所以我们希望将其的背景颜色设为当前窗口的背景颜色。我们所要做的就是先将应用程序窗口的背景颜色取出来，然后再赋给QTabWiget 类的每个标签，比如说我们有tab1和tab2两 阅读全文
