Categories
Mastering Development

Counting swaps using std::sort

Is there a portable, minimal-overhead way to count the number of swap operations performed during a std::sort in C++? I would like to do this because I need to compute the sign of the permutation used to sort the list, and I was wondering if there was a way to reuse std::sort for this rather […]

Categories
Mastering Development

JPQL/HQL – Combine DATE and TIME fields into a DATETIME/TIMESTAMP

In the database table, there are separate columns for Date and Time. I’m not able to change the table structure but I need to be able to treat it as a single DATETIME field. In MySQL, I can do TIMESTAMP(date, time). Is there anything equivalent to this in JPQL?

Categories
Cryptocurrency Ethereum Mastering Development

Trying to do interaction between 2 contracts. But compilation failure showing should be declared Abstract

WinCon.sol EnemyCon.sol To create interaction, I am creating interface for EnemyCon in WinCon.sol, but Remix is throwing compilation error stating "EnemyCon should be marked abstract". I tried changing keyword Contract to Interface, but then then further it is not calling the function from other code. Please help, let me know what am I missing ?

Categories
Mastering Development

Why do I get seg fault when using char* in my struct name but not when I use char[]?

I am just trying to understand why i get a segmentation fault when I use char *name as the member of the struct name… as apposed to char name[30] as the member, which works properly. thankyou. struct name { char *name1; // if i make this char name[30]; it works properly }; void name_prompt(struct name […]

Categories
Mastering Development

How can I check if a number is divisible by one of the elements in a list (Python)?

So I am trying to do this problem where I have a number and I’m trying to create a list of multiples from both numbers of the list. For Example: list1 = [9,10,12,16] So I have these two lists. Say I have a number 56. I do I check if 56 is divisible with all […]

Categories
Mastering Development

Converting primitive array of int into ArrayList in Java: “java.lang.ClassCastException: [I cannot be cast to java.lang.Integer”

I wondering how can I convert a primitive array of integers to a list of Integer? compile error isn’t: int[] nums = {0, 1}; List<Integer> list = new ArrayList(Arrays.asList(nums)); list.get(0); But thjis one: int[] nums = {0, 1}; List<Integer> list = new ArrayList(Arrays.asList(nums)); int a = list.get(0); fails with: java.lang.ClassCastException: class [I cannot be cast […]

Categories
Mastering Development

Reason for filter(admin_approved=True,valid_from__lte=now, valid_to__gte=now) not working immediately?

I have a project where there are posts that I want to be displayed for a certain period of time valid_from and valid_to so the issue here is that I have added the correct filters and choosen the time but the posts keep displaying although the time valid_to has passed. I was in doubt until […]

Categories
Mastering Development

Pyspark get count in aggregate table

I have a table that looks like this: +————-+—–+ | PULocationID| fare| +————-+—–+ | 1| 5| | 1| 15| | 2| 2| +————-+—–+ I want to get a table that looks like this: +————-+———-+——+ | PULocationID| avg_fare | count| +————-+———-+——+ | 1| 10| 2| | 2| 2| 1| +————-+———-+——+ Here is what I’m trying: result_table […]

Categories
Mastering Development

How to add using LINQ query in C#

using System; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Text; using System.Text.RegularExpressions; namespace Assignment_1_Keshav_Thakur_991549498 { class PayrollDatabase { static List<Payroll> Payroll = new List<Payroll> { new Payroll("1", "S3001","32", "10", "01-01-2020"), new Payroll("2", "S3002","23", "20", "02-01-2020"), new Payroll("3", "S3003","20", "30", "03-02-2020"), new Payroll("4", "S3004","40", "40", "04-05-2020"), new Payroll("5", "S3005","25", "50", "07-08-2020"), };//Payroll menu public static void […]

Categories
Linux Mastering Development

Plasma desktop freezes, but machine remains operable

I’ve got a Debian 9.13 machine for running LinuxCNC, with KDE/Plasma desktop. Generally everything works well, but every now and again, the desktop will freeze. The mouse still moves the cursor, the screen still goes to sleep after the set time and can be woken up with keyboard input, I can ssh to it, and […]