Questions tagged [complexity]

Complexity is the analysis of how the time and space requirements of an algorithm vary according to the size of the input. Use this tag for reviews where the "Big O" is a concern.

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Extended stable marriage challenge

I've written a solution for the stable marriage problem in the case that the number of men is not equal to the number of women. My problem is not that I can't prove my code is right. The problem is I ...
Arman Malekzadeh's user avatar
2 votes
2 answers
658 views

Finding number of number pairs with given difference [closed]

pairs() is a function which returns the total number of combinations whose difference is k. ...
Rahul Singh's user avatar
13 votes
7 answers
2k views

Finding the most popular element with C# given O(1) space complexity requirement

I have tried to solve the following problem in C# with LINQ: Given an integer array, find the most frequent number and it's count in the array. If multiple numbers have the same highest frequency ...
tugberk's user avatar
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13 votes
5 answers
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"Algorithmic Crush" problem hitting timeout errors

This is the HackerRank problem Algorithmic Crush: You are given a list of size N, initialized with zeroes. You have to perform ...
enthusiastic's user avatar
12 votes
3 answers
2k views

Given some integers, return the k most frequent elements

Given a non-empty array of integers, return the k most frequent elements. For example, given [1,1,1,2,2,3] and k = 2, return <...
Stack crashed's user avatar
9 votes
2 answers
9k views

URLify a string using Python

I have been working my way through the exercises in the book Cracking the Coding Interview. I wanted to get feedback for the following exercise. Write a method to replace all spaces in a string ...
Average's user avatar
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8 votes
2 answers
12k views

Finding the largest repeating substring

Here's my code that takes a large string, and searches for the longest reoccurring substring. It compares the first letter with every other until it finds a match, then saves it. Then it compares the ...
Andrew Tsay's user avatar
8 votes
2 answers
2k views

Codility "max slice swap" challenge

Problem Description: Find the maximum sum of a compact subsequence of array elements after performing a single swap operation. Solution: ...
Jay's user avatar
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7 votes
1 answer
510 views

Check consistency of a list of statements, with fuzzy rhyme matching

I made a program today that solves the following problem on a programming competition site (open.kattis.com): Check if all statements with the following format X is Y or X not Y are consistent. X and ...
Linus's user avatar
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7 votes
3 answers
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Find the total number of ways W, in which a sum S can be reached in N throws of a dice

I was solving this question: Given there is a 6 sided dice. Find the total number of ways W, in which a sum S can be reached in N throws. Example: S = 1, N = 6 => W = 0 S = 6, N = 6 => W ...
Harsha's user avatar
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6 votes
5 answers
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Sort an array of 0s, 1s and 2s in Java

Write a program to sort an array of 0's,1's and 2's in ascending order. Input: The first line contains an integer 'T' denoting the total number of test cases. In each test cases, First ...
Anirudh Thatipelli's user avatar
6 votes
1 answer
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MaxCounters solution

I am doing this Codility problem You are given N counters, initially set to 0, and you have two possible operations on them: increase(X) − counter X is increased by 1, max counter − all ...
Sidharth Samant's user avatar
6 votes
1 answer
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Stable radix sort in-place using O(1) space

I am trying to implement a stable radix sort in place with O(1) space. I've seen Wikipedia, and I notice the C implementation is using a temporary variable to hold the sorted value for each pass, and ...
bysreg's user avatar
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6 votes
2 answers
1k views

Genomic Range Query

Recently I worked on one of the Codility Training - Genomic Range Query (please refer to one of the evaluation report for the detail of this training). The proper approach for this question is using ...
Ming-Chen's user avatar
5 votes
3 answers
13k views

Rotate image 90 degree clockwise

* Time complexity: O(N) * Memory complexity: \$O(1)\$ Is my calculation of complexity correct for this code? ...
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4 votes
1 answer
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Find given number by summing up integers from 2 sorted arrays

I am working on an algorithm question in which I need to find out pair of number out of 2 sorted arrays which sum up to the given number. I need to print out the indexes of those pairs rather than ...
Sneh's user avatar
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3 votes
0 answers
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Benchmarking multiple implementations of a Code Kata: queue for the self-checkout tills at the supermarket

I was reading this question: Why is my function timing out when run with a larger data set? And although I couldn't quite grasp the OP's implementation and so didn't feel like answering. I did some ...
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2 votes
4 answers
273 views

Long arithmetic addition in JS

The implementation of the algorithm which adds two number in string form with arithmetic rules. ...
kharandziuk's user avatar
2 votes
2 answers
10k views

Fibonacci sequence implementation

This was too slow for my computer: ...
Normal People Scare Me's user avatar
2 votes
1 answer
64 views

Merging Two Bubble Sorted Linked Lists (Python)

I'm following a tutorial on merging two bubble-sorted Single Linked Lists in Python. merge1 creates a new list and does the merging. Other than naming ...
Emma's user avatar
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1 vote
1 answer
303 views

Printing subarrays ⚡

I was trying to to print all subarrays of an array in quadratic time. Here is my code: ...
Vaibhav Vishal Singh's user avatar
1 vote
2 answers
347 views

Massive file sorting algorithm

I was trying to sort a massive file of successive chars in C. I did some research and found a few file sorting algorithms that look the same. Their main idea is to read an amount of data to memory, ...
wassimoo's user avatar
1 vote
0 answers
67 views

Why is my function timing out when run with a larger data set?

I am working on a Code Kata ...
MicFin's user avatar
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1 vote
3 answers
75 views

Mixed Duo String Generator 2 [duplicate]

I've create a program that finds mixed duo within a string. It removes characters from a string that do not form the first mixed duo. It does not rearrange the order of the string, it ony remove ...
Laurent's user avatar
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1 vote
1 answer
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Hackerrank "Breaking the Record" solution

I have solved the hacker rank problem listed here. Given a sequence of scores, I need to count the number of times the records for the high and low scores have been broken. Easiest way for me was to ...
Bagira's user avatar
  • 171
0 votes
1 answer
75 views

Choosing between 2 Fibonacci alternatives [closed]

Task: Return the fibonacci value at a given index. e.g: input: 6, return: 8. Algorithm 1: ...
Elya Livshitz's user avatar
0 votes
1 answer
50 views

Time complexity of tape equilibirum

As per the instructions on this Tape Equlibrium-Codility I've written the code ...
RAN_0915's user avatar
  • 153
0 votes
4 answers
7k views

Finding all integers in an array with odd occurrence

I am doing an interview exercise problem from here. The problem is to find "all numbers that occurred an odd-number of times in an array". Here is my high level psuedo code thinking: Construct a ...
committedandroider's user avatar