Solution "Longest Substring Without Repeating Characters" on Leet Code

class Solution {
public:
    int lengthOfLongestSubstring(string s) {
        string candidate_str = "";
        string checking_str = "";
        size_t position = std::string::npos;
        for (auto& ch : s)
        {
            position = checking_str.find(ch);
            if (position …

Solution "Add Two Numbers" on Leet Code

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode …

Two Sum solution on Leet Code

The simple solution

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        for (int i = 0; i < nums.size(); ++i)
        {
            for (int j = i + 1; j < nums.size(); ++j) …

Let's take a look at a small code example when a method is called on an object that is initialized with nullptr .

Sample code

We are given the following program code.

#include <iostream>

using namespace std;

struct X
{ …

This article is the most comprehensive description of signals and slots in QML compared to all previous articles on this site.

In this article, I will try to explain the following when working with Qt/QML + Qt/C++:

• ways to declare …

I propose to consider the option of using variables declared in the CMakeLists.txt file in C ++ code.

To begin with, what is it for? For example, you want to specify the version of the program and some other auxiliary …

A small note about static linking Boost, so as not to forget.

Initial data:

• OS Windows
• MSVC 2017 64bit
• Boost 1.68.0
• CMake project

An example will be shown in the simplest version without special variable settings. Maximum default.

Step 1 …

Let's write a small example of an application in which a button will be moved using property animations. To do this, we use the QSequentialAnimationGroup and QPropertyAnimation classes.

QSequentialAnimationGroup is a class that combines several animations into one group, which …

And here is an article on the boost of my some accumulated materials. I offer you the option of writing a console program with support for the console menu, which is implemented using boost::program_options .

boost::program_options is responsible for processing …

Start at work to use a compiler that supports the standard C++17.

Actively we begin to use various features from this standard..

I was pleased with the [[fallthrough]] attribute for switch case constructions.

The essence of this attribute is that …