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kandi X-RAY | Coderpad Summary
kandi X-RAY | Coderpad Summary
大家伙儿们,又见面了。 自上次Byemess Todo之后,觉得自身不足还是挺多的,期间又萌生了一些将它重构加上更多新特性的想法,之后技术磨炼一阵再来好好改造它。对于Learn by doing这种事情,一次就会上瘾啊有木有️,于是乎本着继续精进练习React技术栈,以及实践更多相关技术的初衷,besides that,自己还想再准备一个小项目来为找工作打底气,于是乎就有了CoderPad。.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Coderpad
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QUESTION
Taking an interview within CoderPad for c# and wondering if we can set breakpoints for easy debugging. I looked at the Sandbox they provide and I don't see any obvious way to do it. Are we only left with Console statements or other mechanisms to output results, like to a text file, for reviewing what the code is doing?
...ANSWER
Answered 2021-May-21 at 02:14No, you cannot set breakpoints in Coderpad. The only means of debugging I know is to print to console.
QUESTION
I have a char*
array which gets converted to void*
, but I am having difficulty accessing the original array. See the args
array:
ANSWER
Answered 2021-Feb-18 at 23:22You must cast args
to char **
, because args
is a pointer to the first element, which itself is a char *
. So you have a so-called "double pointer", i.e. a pointer to a pointer. After that, you can use the []
subscript operator on it, and the second type cast is unnecessary.
The reason why the code you linked to in the comments section works, but the code in your original question doesn't, is probably the following reason: The lifetime of the array args
in the function run_async
is limited to the lifetime of the function run_asyc
. You therefore have a race condition. If the function run_async
exits before copyFile
reads the array, then the array may have meanwhile been overwritten by something else.
To prevent this race condition, you should ensure that the lifetime of the array exceeds that of the thread created by _beginthreadex
, for example by
using a global array (simplest solution, but sometimes considered bad programming practice), or
allocating the array in the function
main
instead ofrun_async
, orallocating the array with
new[]
ormalloc
and only callingdelete[]
orfree
after the second thread has terminated, or by making the second thread responsible for callingdelete[]
orfree
when the array is no longer required.
However, as pointed out in the comments section, using a C-style array and calling the function _beginthreadex
is not the ideal way to solve your problem in modern C++. If you use std::thread
instead of _beginthreadex
and use std::array
instead of a C-style array, then you can simply pass the array by value to the new thread. That way, you don't have to worry about freeing the memory of the array, because there is no dynamic memory allocation. This solution also has the advantage that your code will be portable, as you are no longer using platform-specific functions.
QUESTION
I'm trying to dynamically generate some dropdowns in react and each new dropdown will be referencing an index in an array that is held in my state, but for some reason setState()
with boolean values won't allow for concatenation.
ANSWER
Answered 2020-Oct-24 at 02:03The onClick
handler ends up enqueueing multiple state updates.
QUESTION
For some reason this works everywhere else except for coderpad. In every ide I had it works fine when I run it. This seems to make no sense to me. Is there an issue with the static setup or no?
...ANSWER
Answered 2020-Oct-17 at 19:16According Languages support for run Java.
You should define a public class named Solution with a public static void main.
Rename the class to Solution
, like:
QUESTION
I'm solving a problem where I need to find all triplets that add up to zero within an unsorted array of ints and return them as a List.
I can't figure out why Coderpad is giving me an Out of Memory error when I run this code. What am I missing?
Here is the prompt and logic:
Given an array of unsorted numbers, find all unique triplets in it that add up to zero.
Input: [-3, 0, 1, 2, -1, 1, -2] Output: [-3, 1, 2], [-2, 0, 2], [-2, 1, 1], [-1, 0, 1]
Brute Force:
Find all trio combinations within array
O(N^3)
Approach:
Sort Array
Iterate through array in a for loop
Use two pointers on opposite ends on the remainder of the array
If element at input[i] + input[left] + input[right] < 0 => left++
If element at input[i] + input[left] + input[right] > 0 => right--
Else, add input[i], input[left], input[right] into List result
Complexity:
O(N^2) O(N)
...ANSWER
Answered 2020-Jul-21 at 19:20In your else
case inside the while
loop, we add an item to the array but the while
condition remains true
(because we didn't change the value of left
or right
), so the loop continues to run, constantly adding the same three items to the result
variable.
To solve this, add a break
statement to break out of the while
loop when we add to result
:
QUESTION
I can't seem to find a defined theme used by Coderpad by default see here https://coderpad.io/sandbox
The closest thing I found was https://vscodethemes.com/e/SarahRidge.vscode-monokai-minimal however some things seem off. Does anybody know what theme they use?
...ANSWER
Answered 2020-Jun-16 at 16:33The colour scheme seems to be a custom one from a Monokai family. The closes I was able to find out of the box is https://github.com/sarcadass/vscode-monokai-alt
QUESTION
I have a very simple func in Xcode playgrounds which works when I run it. But when i try to run the same code in CoderPad it gives me the following error Solution.swift:18:1: warning: result of call to 'isPalindrome(word:)' is unused
isPalindrome(word:"racecar")
Here is the code
...ANSWER
Answered 2020-Apr-28 at 05:56Try this:
QUESTION
I am preparing for a technical interview coming up soon and the online IDE is coderpad. I have been trying to run my code for sometime now and it is simply not printing anything. I know the solution has to be something minor. This is my first time working in coderpad is it similar to playgrounds?
Here is my code
...ANSWER
Answered 2020-Apr-24 at 16:34You’re just declaring the class and its method. But you never run it. You actually have to execute it:
QUESTION
I have a number of algorithm based coding interviews (coderpad.io) and online challenges like hackerrank coming up in Objective-c. I do not do these often and want to understand if I'm allowed to use built in sorting, searching and compare functions like below to solve algorithmic questions.
During a coding interview, do I have to pretend like the Objective-c has no sorting, reversing and other utilities?
Or is everything fair game, just get the solution out?
If there's a better medium to ask this question, please tell me where to post this.
From here: https://rosettacode.org/wiki/Longest_increasing_subsequence#Objective-C
...ANSWER
Answered 2018-Mar-01 at 16:23During a coding interview, you can always ask if you can use such-and-such a function from the library, but generally you can as long as that doesn't save you from actually having to solve the problem.
If you're asked to implement a sort, for example, you shouldn't do it by calling the library sort. If you're asked to implement a class that accomplishes some task, then you shouldn't do it by delegating to a class that's already provided to perform that task.
The above implementation of patience sorting would generally be fine, since none of the library functions called is specifically related to the longest-increasing-subsequence problem.
In a coding interview, you should really be thinking of this the other way around: The question is an opportunity to demonstrate your skills. What do you want to show off?
QUESTION
I have an interview coming up in which I will write code in Coderpad. What is the syntax to write SQL in Coderpad? (note Coderpad with an "r", not Codepad).
First, you select a language for Coderpad. I am selecting Scala.
Here is a database they provide:
...ANSWER
Answered 2018-Jan-13 at 17:50You'll need to connecto to your database just as you would do that in Java
They should provide you the database information to connect, so you need to do the following steps (writing from memory, sorry is something is missing)
import the required classes:
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