logic – Priority between involvement and bi-involvement

I came across this question:

Let p, q and r be the propositions

p: Grizzlies have been seen in the area.
q: The hike is safe on the trail.
r: The berries are ripe along the trail.

Write these propositions using the p, q and r and logic connectors (including negations).

If the berries are ripe along the trail, the hike is safe if and
only if grizzlies were not seen in the area.

I see a Yes r,q Yes Yes ~p or
Yes r,q is the part "If berries are ripe along the trail, hiking is safe"
and ~p is "grizzlies have not been seen in the area"

and I came with (r -> q) <-> ~p

But the answer given is: r -> (q <-> ~p)

Can any one please explain the difference of priority?

java – Priority queue for minimum heap

General summary

Make all instance fields that are never reassigned final.

 private final PriorityNode() items;
 private final Set itemSet;

Make the constants static and read-only, and use underscores for readability.

 private static readonly int INITIAL_CAPACITY = 4;
 private int capacity = INITIAL_CAPACITY;

Do not introduce new useless lines. For example, between the class definition and the instance variables. Zero or a new line would suffice.

public class ArrayHeapMinPQ {

   private PriorityNode() items;
public class ArrayHeapMinPQ {
   private PriorityNode() items;

Do not write comments that state the obvious. This pollutes the source code. Write comments for when they would really make sense.

   // Declaring a construtor to intialize items as an array of PriorityNodes
   public ArrayHeapMinPQ() {

Like the public comments of the API (it's a good thing):

    * Adds an item with the given priority value. Throws an
    * IllegalArgumentException if item is already present
   public void add(T item, double priority) {

Perform argument checks before changing the state of the instance. (And delete those comments that have no added value)

public void add(T item, double priority) {

       // To ensure that duplicate keys are not being used in the queue
       if (itemSet.contains(item)) {
           throw new IllegalArgumentException();
public void add(T item, double priority) {
       if (itemSet.contains(item)) {
           throw new IllegalArgumentException();

It is customary in Java to provide not just add, but also offer methods. add throws an exception, while offer returns a boolean. To support multiple entry points, you must place the actual data insertion in a private method.

private void insert(T item, double priority) {
    items(size + 1) = new PriorityNode(item, priority);

And then refactor add:

    * Adds an item with the given priority value. Throws an
    * IllegalArgumentException if item is already present
   public void add(T item, double priority) {
       if (itemSet.contains(item)) {
           throw new IllegalArgumentException();
       insert(item, priority);

And present offer:

    * Adds an item with the given priority value. Returns
    * False if item is already present
   public boolean offer(T item, double priority) {
       if (itemSet.contains(item)) {
           return false;
       insert(item, priority);
       return true;

priority of messages

Imagine engine:

submit failed => page not found <
page must have1 =! httpstatus: 404

submit failed priority

Imagine engine:

submit failed => page not found <

change the step = 2
change the condition of step = httpstatus: 404

I have not checked yet, but I guess it's the same? This is not good, or there should be some sort of docs for the sake of logic.

emotion – feelings of the user when the pleasure is not a priority

Our Human Factors team is used to managing a user base in which the choice of the tool is mandatory and the training mandatory. Imagine a military context in which the user presses a button to fire a cannon on a tank.

They would argue that the "desirability" of a system plays no role in this context.

Most of the UX materials I've found are commercial-oriented and it's easy to justify their desirability, but I find it difficult given the context.

How would you justify that the emotional state of a user is also important given the context above?

arrays – PHP: compare date and time with priority

Hello, I'm just New in php and is currently working on date hour.

Recently, I asked here to get the total working hours.
Click here!

But I have encountered a problem when the employee saves early.
I think it's the moment time_start since at the beginning of and To expand is do not counted.

So I go out with priority in the calendar.
Table of program and newspapers :

$ schedule = [
    0 => [
        'priority' => '1',
        'time_start' => '08:00:00'
        'time_end' => '12:00:00'

1 => [
        'priority' => '2',
        'time_start' => '13:00:00'
        'time_end' => '17:00:00'

$ logs =[
    0 => '2019-07-10 07:10:00'
    1 => '2019-07-10 12:10:00'
    2 => '2019-07-10 13:00:00'
    3 => '2019-07-10 18:00:00'

Here, newspapers should be this one:

0 => 2019-07-10 10: 00: 00 & # 39;
1 => & # 39; 2019-07-10 12: 00: 00 & # 39;
2 => & # 39; 2019-07-10 13: 00: 00 & # 39;
3 => & # 39; 2019-07-10 15: 00: 00 & # 39;

And my total working hours will be 8hours

Sorry for my bad explanation. Any help is appreciated:>

Sorting a table with a priority queue with the help of a heap

I would appreciate that anyone can report errors.

My process is to convert the array into a complete binary tree, then perform a batch use of the insert in order to get the largest element at the top, and then generate the state of the segment of memory.

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What is the flexible priority mode (Fv) on recent Canon cameras and how good is it?

Some recent Canon cameras (at least EOS RP) have a flexible priority mode (Fv). Apparently, it performs an automatic exposure, but also allows to set various parameters manually.

  • What is this mode doing exactly?
  • What's so good?
  • What can be done with Fv mode that can not be done easily on a traditional camera without Fv mode?

For me, the Fv mode looks like another way to jump between P, Av, Tv and M. So for me it's a duplicated feature on the camera and simply moves some settings from the main mode selector to the rear top selector.

The only interesting feature of Fv seems to be the very easy access to exposure compensation (I did not find how to set exposure compensation on EOS RP without using the menu in P, Av, Tv and M + mode auto-ISO), but this is nothing revolutionary; The 2000D provides easy access to exposure compensation.

Oh, and one of the advantages of Fv is that the "mode guide" is not displayed for about 10 seconds when you change what is set manually and automatically. By moving at least the main mode dial on EOS RP, you will see the annoying "mode guide".

However, these problems seem minor. Is there something revolutionary about the Fv mode that I do not see?

I would vote for a Democrat more than Trump in 2020, but does any of them support strong security at the border and give priority to US citizens?

Trump said he wants to tighten border security because Mexicans are killing people who can be associated with both his construction company and his casino. Money and drugs can have a significant impact on both areas.

The average Democrat does not care about Trump nor his opinions since he wants to ship drugs with illegal immigrants for their cheap labor.

This corresponds to the Communist Democratic Manifesto of the spread of democracy around the world.

As an American, I do not want anything of the above, but I do not produce cash flow for the greedy and the greedy have a lot of trouble using me at all in their schemes.

So, in my opinion, none of the Democrats beyond a possible Kennedy deserves to be elected.

Or a Roosevelt.

But you do not see them running now, is not it? Just a car and vacuum seller who wants to import more junk and sell it to illegal aliens, slaughter the few remaining cows and other cattle at Spanish and California Gold. It's still there in its billions.


webpart script – List view – Priority color

I've looked at Shannak's Priority List View – and I can make it work in a to-do list, but not in a normal list.

Below is an example of what I'm trying to accomplish.

What I'm trying to accomplish

The code I use is:

I can not use calculated columns to achieve this because administrators disable this feature. Currently, that's how I work, but now we have to find other ways to do the same thing.

operating systems – Priority Inversion

I know that priority inversion is a process in which a higher priority process is delayed by a lower priority process, which should not be the case, but I am unable to think of such examples. Any explanation with an example will be of great help.