judge | Online Judge Kernel，Virtual Judge Adapter，Command-Line | Telnet library
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Lines of Code : 15License : Non-SPDX (NOASSERTION)
Copy#如输入dis us和完整输入display users都能执行命令获取当前登录系统的用户
Judge-Kernel]dis us
# Type Delay Network Address Socket Username
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+ 0 Console 00:00:00 127.0.0.1 - Community Discussions
Trending Discussions on judge
QUESTION
This is a part of code in an arduino SPI communication instance.
...ANSWER
Answered 2021-Jun-09 at 19:14Before explaining, you have to understand a few things:
- Characters (i.e., a
chartype) can be treated as a number without any cast based upon its ASCII encoding - Strings in C always end with a NUL terminator. Importantly, this character has a numerical value of 0 (i.e., when you treat it as a number, it's equal to zero).
- Boolean values don't really exist in C independant of an integer representation. Zero is treated as "false" and anything else is treated as "true".
With this out of the way, let's look at what's happening in the loop.
First, we have a pointer p that points at the first character of the string "Hello world!\n" (this is coming from the statement const char* p = "Hello, world!\n").
At the top of the loop, we check our loop condition, which is c = *p. Note that this assigns the value pointed at by p into c, and assignments in C evaluate to the value that's been assigned. What that means in this context is that our test is essentially just *p.
Since booleans don't exist in C, *p is false only when the character pointed at by p has a value of zero. This can only happen when p is pointing to a NUL terminator, which is always at the end of a string in C. Therefore, our loop will stop when we've hit the end of our string.
QUESTION
I'm kind of new so try not to judge me. I'm trying to create a little 2d game based on the old 2d Mario. I already have home window, the sign up and login windows, and I've got a json file to save the usernames and passwords. Now, I'm trying to get the login function to work. The problem seems to be this line:
...ANSWER
Answered 2021-Jun-09 at 01:03According to the code of SU(), the content inside the JSON file (also the content of players) should be something like below:
QUESTION
class Solution {
private Integer[][] memory = //whaterver, It doesn't matter.
public int leetcode(int[] array) {
return Math.max(dfs(0, 0), dfs(0, 1));
}
int dfs(int status1, int status2) {
if (status1 == Integer.MAX_VALUE || status2 == Integer.MAX_VALUE) {
return 0;
}
if (memory[status1][status2] != null) {
return memory[status1][status2];
} else {
memory[status1][status2] = calculate() + Math.max(dfs(status1 + 1, status2), dfs(status1 + 1, status2 + 1));
return memory[status1][status2];
}
}
Integer calculate() {
//...
}
}
ANSWER
Answered 2021-Jun-03 at 06:57You can make a variable accept nulls by using ?
In Kotlin, the type system distinguishes between references that can hold null (nullable references) and those that cannot (non-null references). For example, a regular variable of type String cannot hold null:
QUESTION
The topic link:https://codeforces.com/contest/109/problem/D
For the question, I'm time limit exceeded on test41
I guess that the data structure used is not appropriate, but I have thought about it for a long time and I don't know where to adopt a good data structure, please give me some advice.
algorithm ideas:
This approach is somewhat similar to selection sort. First, find a lucky number, then swap the position with the first number, then start from the second, find the smallest number, and then swap it with the lucky number, so that the smallest number starting from the second is placed at the first position, the lucky number is now in another position, and its position is recorded. Then swap the lucky number with the second number, and then repeat the above process. Special attention should be paid to the fact that we need to record the position of the lucky number we selected after sorting because the process before and after the position is slightly different and needs to be compared(This is explained in the code comments).
...ANSWER
Answered 2021-May-29 at 05:54The nested loop used to find MINID makes the runtime quadratic in n:
QUESTION
The main goal I try to get is, the correct display data from the database, let me try to explain with the code.
This is my form code for now:
...ANSWER
Answered 2021-May-28 at 12:03 ">
fetchAll() ): ?>
QUESTION
So here we are packing objects and Both Length, Width and Height of object should be less than 50 for a good case and if any is more than 50 then the case is bad. I have written my program below but all cases are judged by the last case.
Sample input
2
20 20 20
1 2 51
Sample output
Case 1: good
Case 2: bad
...ANSWER
Answered 2021-May-27 at 15:50If your problem is that all cases are judged by the properties of the last case (though, as has been noted, it is not clear what this means for the results of your code as given), then it could be because when case is assigned in:
QUESTION
I am trying to make a C++ program to count the number of Leaf Nodes in a generic tree using a Recurisve approach.
here is my code:
...ANSWER
Answered 2021-May-27 at 08:24There is a problem in your countLeafNodes function.
QUESTION
I'm new to python and trying to get a list of the most popular trigrams for each row in a Pandas dataframe from a column named ['Question'].
I've come close to what I need, but I am unable to get the popularity counts at a row level. Ideally I'd just like to keep the ngrams with a minimum frequency about 1.
Minimum Reproduceable Example:
...ANSWER
Answered 2021-May-22 at 21:45Input data (for demo purpose, all strings have been cleaned):
QUESTION
I am using SpannableStringBuilder to show image inside TextView. However, if the image will stay at the end of the line in TextView it just disappears. If I increase the size of the text it would be visible again. How can I fix it?
This is the code how I added the image inside TextView:
...ANSWER
Answered 2021-May-22 at 04:09I have solved my problem by adding a flag called Spannable.SPAN_EXCLUSIVE_EXCLUSIVE to Spannable String Builder.
QUESTION
I'm trying to draw a chalk outline on the body using vertex component of p5js. Below is an image showing an attempt to draw an outline on the image in question, and my current code. I am new to coding. Please use basic terms.
...ANSWER
Answered 2021-May-21 at 17:17Unfortunately, you basically have to draw the outline manually with a bunch of points, just the way you've done so far (there are ways to do it automatically, but the only ones I know of require some pretty advanced techniques). Here's some code that might help you figure out where to draw the points:
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