Svetliy

Author: Andrey

  • Finding a next lucky number with C++.

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    Andrey
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    This is an easy task for Monday from Week of Code at Hackerrank. The task is to find a next lucky number based on given 6 digit integer. #include <bits/stdc++.h> #include <string> using namespace std; bool isLucky(int x) { int digit6 = x % 10; int digit5 = (int)((x % 100) / 10); int digit4…

  • Missing Numbers Hackerrank problem with C++

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    Andrey
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    https://www.hackerrank.com/challenges/missing-numbers/problem Solved using sorting two arrays, finding missing number in the loop and putting them in the set. #include <cmath> #include <cstdio> #include <vector> #include <set> #include <iostream> #include <algorithm> using namespace std; set<int> findMissing(int n, vector <int> ar1, vector <int> ar2) { // using default comparison (operator <): sort (ar1.begin(), ar1.end()); sort (ar2.begin(), ar2.end());…

  • Insert a node into Linked list with C++

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    Andrey
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    Check if Linked List is null and just create a Node. Otherwise, run to the end of the linked list and insert a node at the end. /* Insert Node at the end of a linked list head pointer input could be NULL as well for empty list Node is defined as struct Node {…

  • 2D Array easy hackerrank challenge in Swift 3

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    Andrey
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    https://www.hackerrank.com/challenges/2d-array Had to refresh memory how to parse input from Hackerrank in Swift 3. import Foundation; func run() { var arr : [[Int]] = [] for _ in 0 … 5 { let numbers = readLine()!.components(separatedBy: [” “]).map { Int($0)! } arr.append(numbers); } var maxSum = calculateHourglass(arr: arr, x: 0, y: 0) for i in…

  • Display image from Google Docs in the Github readme

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    Andrey
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    The easies way to add an image to the Github readme that I can think of is displaying it from Google Drive. Since the assets are already hosted there. Paste in the link into Readme.md file on github: <a href=”https://drive.google.com/uc?export=view&id=”><img src=”https://drive.google.com/uc?export=view&id=” style=”width: 500px; max-width: 100%; height: auto” title=”Click for the larger version.” /></a> You’ll need…

  • tvOS 10 wide top shelf Image size

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    Andrey
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    tvOS 10 brings new things that are required Top shelf wide image size is: 2320px by 720px

  • How to hide strange unwanted Xcode 8 logs

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    Andrey
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    Running app in the simulator in a new shine xcode 8 noticed that there are a lot of extra information that is coming from the logs. To disable it and see regular logs do the following: 1. Click on your project name and select “Edit Scheme” 2. Add environment variable OS_ACTIVITY_MODE and set it to…

  • Singleton in iOS

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    Andrey
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    Recommended way of creating singleton according to Apple is in the following way: + (AKMySingleton *)sharedInstance { static AKMySingleton *_sharedInstance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _sharedInstance = [[[self class] alloc] init]; }); return _sharedInstance; } Dispatch-once is a synchronous operation that will make sure that there are no multiple threads that are trying…

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    Andrey
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    Problem Given an array of elements, find the maximum possible sum of a Contiguous subarray Non-contiguous (not necessarily contiguous) subarray. Empty subarrays/subsequences should not be considered. Input Format First line of the input has an integer . cases follow. Each test case begins with an integer . In the next line, integers follow representing the…

  • Diagonal Difference from HackerRank in Swift

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    Andrey
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    Problem Given a square matrix of size , calculate the absolute difference between the sums of its diagonals. Input Format The first line contains a single integer, . The next lines denote the matrix’s rows, with each line containing space-separated integers describing the columns. Output Format Print the absolute difference between the two sums of…