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Evgenij LegotskojJune 13, 2022, 5:15 a.m.

C++Leet Code Solutions - 003 - Longest Substring Without Repeating Characters

cpp, LeetCode, C++, C++17, string

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 …
Evgenij LegotskojJune 13, 2022, 4:13 a.m.

C++Leed Code Solutions - 002 - Add Two Numbers

LeetCode, cpp, C++

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 …
Evgenij LegotskojJune 13, 2022, 3:58 a.m.

C++Leet Code Solutions - 001 - Two Sum

cpp, LeetCode, C++

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) …
Evgenij LegotskojJuly 21, 2020, 2:31 a.m.

C++Method call on nullptr

UB, nullptr, cpp

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
{ …
Evgenij LegotskojNov. 4, 2019, 5:15 a.m.

QMLQML - Tutorial 036. Working with Signals and Slots in QML

Slot, QML, Signal, cpp, Qt

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 …
Evgenij LegotskojAug. 9, 2019, 6:09 p.m.

CMakeUsing variables declared in CMakeLists.txt inside C ++ files

cmake, C++, cpp

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 …

Evgenij LegotskojNov. 29, 2018, 2:10 p.m.

BoostBoost - static linking in CMake project under Windows

cpp, Boost, linking, C++, static

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 …

Evgenij LegotskojNov. 18, 2018, 9:52 a.m.

QtQt/C++ - Tutorial 086. Using QSequentialAnimationGroup and QPropertyAnimation to move a button

QSequentialAnimationGroup, cpp, Qt, C++, QPropertyAnimation

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 …

Evgenij LegotskojNov. 18, 2018, 5:57 a.m.

BoostBoost - Console program menu using boost::program_options

cpp, Boost, Menu, C++

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 …

Evgenij LegotskojOct. 23, 2018, 6:11 a.m.

C++C++ 17 - [[fallthrough]] attribute

cpp, C++17, fallthrough

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 …

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C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
  • Rating points-4
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C ++ - Test 004. Pointers, Arrays and Loops

  • Result:50points,
  • Rating points-4
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C ++ - Test 004. Pointers, Arrays and Loops

  • Result:20points,
  • Rating points-10
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Qt/C++ - Lesson 005. QSqlRelationalTableModel - The work with relational tables

Хочу поделится, мы сделали свой вариант QSqlRelationalTableModel и заодно к нему новое развитие QTableView, и получилась готовая таблица PblTableDlg, у которой реализованы внешние связи, комбобо…
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Qt WinAPI - Lesson 004. QtIFW - Automation WinDeployQt and build installers with Qt Installer Framework

Hello Evgenij, regarding the online installer, I've tried many times to use web host for the created repo after repogen step. I tried using github but I found people talking it is not …
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Qt/C++ - Lesson 051. QMediaPlayer – simple audio player

PS. Почти дописал плеер на QML. Уперся в ограничения QML. Переписываю плеер на с++/qt, а графика останится в qml. Нашел то, что мне надо, а именно индикатор звука. Qt может перехватывать аудиопо…

Qt/C++ - Lesson 039. How to paint stroke in QSqlTableModel by value in the column?

В этом случае вижу только какой-нибудь костыль в стиле перебора по всем индексам в заголовке с помощью методу headerData . То есть пройтись в for цикле пока не будет совпадения н…
a
  • avt
  • Dec. 12, 2022, 9:06 a.m.

Qt/C++ - Lesson 039. How to paint stroke in QSqlTableModel by value in the column?

Спасибо за ответ. Нет, дело не в читаемости кода, в разных таблицах у меня есть столбцы с одинаковым именем, но с разными индексами. Хотел сделать решение по имени столбца для всех таблиц сразу.…
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django rest framework лишние символы

Покажите код сериализатора вашего.

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нужно высчитывать координаты того, что должно двигаться, полагаю, что тот маленький круг, и в случае выхода за пределы круга менять переменную типа bool на true/false, которая в свою очередь буд…
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Как добавить виртуальную клавиатура с Т9 в своей проект на QML.

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