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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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Complexity analysis for while loop + list.insert()

I have the following code for merging two sorted arrays in-place: ...
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2answers
39 views

Incrementing specified list values, with “catch-up” [closed]

I completed a coding challenge recently in which my function was to be given two parameters: N, the number of counters to be used (numbered 1 through N) - and A, an array of integers. Iterating ...
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Mixed Duo String Generator Part 2

Mixed Duo String Generator Hello again; Previously my code was critique and I applied this feedback to form my new revised code for the Mixed Duo String Generator. In the code below I revised it to ...
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3answers
62 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 ...
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1answer
49 views

Find maximum in sorted and rotated array

This is an interview question. A sorted rotated array is a sorted array which was rotated 0 or more times. For example: [1,2,3] -> [2,3,1] ...
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2answers
58 views

Place arithmetic signs in correct order to get the number

Given a list of numbers, place signs + or - in order to get the required number. If it's possible then return ...
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1answer
41 views

O(n) Object Pool

I recently rewrote my object pool design to \$O(n)\$ complexity. I did this using a linked list, which is not native in JavaScript. It does not, unfortunately, automatically assign ...
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1answer
37 views

Given an array of positive integers, find shortest subarray whose sum exceeds a threshold [closed]

Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there isn't one, return 0 instead. Example: Input: ...
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0answers
26 views

Find target in sorted array pivoted at some unknown point in O(log n)

You are given an array sorted in ascending order which is rotated at some pivot unknown to you beforehand. Find your target in O(log n) which means it should be a binary search. If the value does not ...
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1answer
61 views

Median of two sorted arrays JavaScript

Trying to find the median of two sorted arrays in O(log(m+n)) or better. I believe this is O(log(m+n) or O(log(m)) or O(n). ...
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1answer
74 views

Form the largest number by swapping one pair of digits

You are given a number. You are given the opportunity to swap only once to produce the largest number. My approach was to use buckets whose values were their indexes and their locations were their ...
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1answer
490 views

Time complexity of Max counters

As per the instructions are given in MaxCounters-Codility, You are given N counters, initially set to 0, and you have two possible operations on them: <...
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1answer
23 views

Time complexity of tape equilibirum

As per the instructions on this Tape Equlibrium-Codility I've written the code ...
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1answer
119 views

Swift - Finding longest binary gap of a given integer

I recently had the chance to try Codility's algorithm training, and the very first one in the list is finding the longest binary gap of a given integer. I tried to implement this in Swift, and after ...
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0answers
74 views

Seating Students (partitioning sort of)

The goal of this code is to seat students in a classroom based on a single test score. We want students to be evenly distributed across the class such that every student is positioned next to the ...
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1answer
51 views

Rearrange an array in place such that the first and last halves are interleaved

Given an array of n elements in the following format { a1, a2, a3, a4, ….., an/2, b1, b2, b3, b4, …., bn/2 }. The task is shuffle the array to {a1, b1, a2, b2, a3, b3, ……, an/2, bn/2 } without ...
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1answer
129 views

Iteratively determine the diameter of a binary tree

Can the performance of the iterative approach be improved? I find that this approach lags behind many recursive options. no recursive answers, please. Baseline recursive approach: takes 52 steps ...
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3answers
104 views

Three Numbers in Java

Given three positive numbers A, B, and C. Find the number of positive integers less than D that are divisible by either of A, B or C. Input format The 1st argument given is an Integer A. ...
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1answer
132 views

Median of two sorted arrays

The task is to find the median of two Arrays. I have an O(n) solution. Can it be written in a better time complexity? ...
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2answers
89 views

Subset Sums in Java

Given an array of integers, print sums of all subsets in it. Output should be printed in increasing order of sums. Input : arr[] = {2, 3} Output: 0 2 3 5 Input : ...
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3answers
259 views

Sort all even numbers in ascending order and then sort all odd numbers in Descending order Java

Given an array of integers (both odd and even), the task is to sort them in such a way that the first part of the array contains odd numbers sorted in descending order, rest portion contains even ...
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5answers
370 views

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 ...
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1answer
62 views

Finding the horse number you will get

I got this question from the interviewbit site test. There are n horses and you are the kth person in the line to ride on the horse. All the persons in the queue will go with the lowest numbered ...
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6answers
431 views

Alone in a Couple implementation in Java

In a party everyone is in couple except one. People who are in couple have same numbers. Find out the person who is not in couple. Input: The first line contains an integer \$T\$ denoting ...
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2answers
121 views

List of Ordered pairs from unordered Pair in Java

Problem statement is Write a method that can take an unordered list of airport pairs visited during a trip and return the list in order. ...
6
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1answer
113 views

Moore-Neighbor Tracing Algorithm

I wrote code to extract the contour of a hole, based mostly on the Moore-Neighbor Tracing algorithm. Only a. instead of finding a shape, I'm finding a "hole"; and, b. I'm looking for the (outer) ...
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1answer
88 views

Reversing the vowels in a String

Given a string, reverse only the vowels present in it and print the resulting string. Input: First line of the input file contains an integer T denoting the number of test ...
2
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1answer
140 views

JavaScript Determine if Number is Lucky

A challenge from Code Fights; a function that takes a number no less than 10 and that will always have an even number of digits and determines if the sum of the first half of the digits equals the sum ...
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1answer
54 views

Anagram checking implementation

Given two strings, check whether two given strings are anagram of each other or not. An anagram of a string is another string that contains same characters, only the order of characters can be ...
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1answer
51 views

Possible letter combinations of a dial pad in linear time using a recursive approach

Time complexity: I walk the initial unzipped array of keys representing the number O(N) backwards. I then do an inner walk of the proceeding array of letters *O(L^2), mapping it to every value in the ...
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1answer
307 views

2D Maze solver using recursion in Python

A company I interviewed for sent me a coding problem to solve. The problem was to find a solution to a maze, not necessarily the shortest one. The input would be like so: ...
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1answer
61 views

Year with the most living (given a list of births and deaths)

I am trying to find the year most people are alive, given a list of births and deaths. I am not sure my approach is optimal or if am calculating the time complexity correctly Break down: I sort the ...
2
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2answers
269 views

Determine if Array has an Increasing Sequence

I wrote a function in JavaScript that expects an array of integers (negative or positive) and determines if that array has an increasing sequence. For the sake of better time performance I made the ...
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2answers
69 views

Non repeating character in Java

Given a string s consisting of lowercase Latin Letters, find the first non repeating character in s. Input: The first line contains T denoting the number of testcases. Then follows ...
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1answer
115 views

Checking whether two lists contain the same elements

I have two lists of numbers: $$\{i_1, i_2, i_3,i_4\}$$ and $$\{j_1,j_2,j_3,j_4\}$$ The problem I want to solve is: Inside a loop, if the following two conditions are satisfied, then it will do ...
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2answers
73 views

Star Elements implementation in Java

Given an unsorted array. The task is to find all the star and super star elements in the array. Star are those elements which are strictly greater than all the elements on its right side. Super ...
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1answer
278 views

Codility: MaxZeroProduct - complexity issues

My solution scored 100% correctness, but 0% Performance. I just can't figure out how to minimize complexity time. Problem: Write a function: ...
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0answers
40 views

Coordination function

This function started very clean but I had to add requirements: Added a Stopwatch to only update the caller periodically. I guess that responsibility could be ...
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2answers
140 views

Greater on the right side in Java

Given an array of integers, replace every element with the next greatest element (greatest element on the right side) in the array. Since there is no element next to the last element, replace it ...
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2answers
401 views

Count the number of occurences of X's within a range in Java

Given an integer X within the range of 0 to 9, and given two positive integers as upper and lower bounds respectively, find the number of times X occurs as a digit in an integer within the ...
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2answers
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Count total set bits

Im am solving Count total set bits: Find the sum of all bits from numbers 1 to N. Input: The first line of input contains an integer T denoting the number of test cases. The first line ...
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2answers
81 views

Check if array contains contiguous integers with duplicates allowed in Java

Given an array of n integers(duplicates allowed). Print “Yes” if it is a set of contiguous integers else print “No”. INPUT: The first line consists of an integer T i.e. the number of test ...
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3answers
339 views

Reverse a sentence in Java

You are given an array of characters arr that consists of sequences of characters separated by space characters. Each space-delimited sequence of characters defines a word. Implement a function ...
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2answers
282 views

Next palindromic number

I wrote a function that takes a number and finds the next palindromic number. Time complexity is currently O(n2), which is really bad. How could one make this function more efficient? ...
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1answer
74 views

For every integer in an array, find the nearest greater integer both before and after it

The given code gives correct output but exceeds the time limit and I have no idea how to optimize it. I know it is of \$O(n^2)\$ complexity but I am not able to get anywhere near to optimizing it. ...
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1answer
34 views
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3answers
296 views

Award Budget Cuts implementation in Java

PRAMP Award Budget Cuts The awards committee of your alma mater (i.e. your college/university) asked for your assistance with a budget allocation problem they’re facing. Originally, the committee ...
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2answers
92 views

Compare Strings

You have been given two strings, A and B (of length N each) and Q queries. The strings contain only 0s and/or 1s. For every query, you are given an index i. You have to update the value at ...
2
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2answers
370 views

Program to shorten URL and decode it back to get original URL

TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL. Design the encode and ...
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1answer
217 views

Max Increase to Keep City Skyline in Java

In a 2-dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the height of any number of buildings, by any amount (the amounts can ...