All Questions
52,413 questions
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31
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Is adding elements to a dynamic array faster than adding elements to a doubly linked list mainly because of modern CPUs?
As it's known a dynamic array eventually has to be resized when the capacity is exceeded and the capacity is being repeatedly exceed as we keep adding new elements (by adding, I mean adding to the end)...
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-4
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0
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53
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How many operations are needed per added (at the end) element in an Array structure vs LinkedList and what are its consequences? [closed]
From my understanding,
Adding (at the end) an item to an array requires:
creating an object and allocating a new place in memory for it
adding the reference to this object into the array
occasionally,...
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1
vote
2
answers
78
views
How to translate a char array into a long and back in Java (not Long.parseLong() or String.valueOf())
I am trying to make a cryptography program using RSA, and need to be able to turn plaintext into a long. Obviously the plaintext would have to have more than just numbers in it, so using Long....
0
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1
answer
99
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Java ArrayList and LinkedList performance [duplicate]
I know that it's a never-ending question that comes back every now and then, but I'm really confused about these two. This is what I understand about them.
In theory:
LinkedList is faster at adding ...
2
votes
1
answer
104
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Why the performance is bad if I use HashMap to solve Codility problem MinAbsSum?
Regarding the Codility problem MinAbsSum at https://app.codility.com/programmers/lessons/17-dynamic_programming/min_abs_sum/, the performance is bad if I use HashMap to solve the problem. I expect the ...
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0
votes
1
answer
58
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understanding a part of recursion for a binary search tree
Hello I basically need to implement a recursive function for insertion of a binary tree. I already implemented the chunk of insertion function (wether it's largest or smaller than root) but there's an ...
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-2
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0
answers
44
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I keep getting a NullPointerException and I don’t know why [duplicate]
I’m trying to create a simple program where I have an array of Person objects. Each person has a name and age, and I’m trying to print out their names.
But I keep getting a NullPointerException and I ...
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0
votes
1
answer
76
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How to group anagrams using collections efficiently? [closed]
I'm working on a Java problem where I need to group words that are anagrams of each other. For instance, given the input array:
["eat", "tea", "tan", "ate", &...
3
votes
2
answers
159
views
How to retrieve individual arrays from arrays of strings stored inside an ArrayList?
I'm working on an assignment where I need to take "books" from the user(a title, an author, and ISBN number, all strings), and store these books somehow, and then do various things to these ...
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-3
votes
4
answers
107
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Needed Aid With Java Schoolwork - Containing Arrays & Array Searchs
Current Outputs:
Is [1, 2, 3] found in [1, 2, 1, 2, 3] ? >>> false
Is [1, 1, 3] found in [1, 2, 1, 2, 3] ? >>> false
Needed Outputs:
Is [1, 2, 3] found in [1, 2, 1, 2, 3]? >>&...
0
votes
1
answer
40
views
Loading a model but i get this error of bytes
private MappedByteBuffer loadModelFile() throws IOException {
AssetFileDescriptor fileDescriptor = getAssets().openFd("model1.tflite");
FileInputStream inputStream = new ...
2
votes
1
answer
68
views
How to Render the same model multiple times
I am trying to render the same 3D object dynamically. When I execute the method responsible for this, the 3D object is rendered on the screen only once. When I execute the method again, it gives me an ...
-3
votes
1
answer
157
views
How can I shuffle an array using a seeded randomiser?
I must prompt for a number range and seed, then create an array of 5 numbers per row that has 2 of each number within the given range, in ASCENDING order. Following this, the order should be shuffled ...
- 13
1
vote
1
answer
48
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Im implementing a python dict. I´m using a doubly linked list, it works until the first resize. How can I change my resize method to make it work?
When inserting the first 8 pairs of keys and values it works perfectly fine and the order is maintained, the problem comes after the resizing. If I insert the pairs (4,4),(5,5),(6,6),(7,7),(1,1),(2,2),...
-1
votes
1
answer
44
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NoSuchElementException and premature closure of scanner
I have made a program that reads 5 integers and outputs its polarity(positive or negative), its type(odd or even). Used Scanner.nextLine() to read the input as string and split it with .split("\s+...
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