This tag is for questions that came up in an interview.

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0
votes
0answers
31 views

Deep copy linked list with arbitrary nodes

The original question can be found here. I implemented method 2: Please comment about style, unit testing, code complexity, time and memory space and complexity. ...
7
votes
6answers
759 views

Given an array of integers, return all pairs that add up to 100

I was recently given this programming challenge on an interview, and I decided to use javascript to solve it. I did, but I'm not happy with my implementation. I can't help thinking there must be a ...
2
votes
1answer
40 views

3Sum 2 Different implementations complexity

These are 2 implementations for the http://en.wikipedia.org/wiki/3SUM problem, The first one is mine. and in the second one I implemented Wiki's pseudo code. Can someone please tell me if there is a ...
6
votes
2answers
94 views

Tree traversal into List

The interview question was to traverse a tree into a list. ...
5
votes
1answer
52 views

Word break problem with dynamic programming

This is the original question. I have implemented it in both ways. If I enter the word "icecream", should I output "ice" "cream" and also "icecream", or just "ice" and "cream"? Is this a good ...
4
votes
2answers
79 views

Pairing anagrams in a string list

The task was to check for pairs of anagrams in a string list. I first sorted all the words. and looped over the letters. The interview continues with a follow-up, to do the same with limited memory. ...
4
votes
3answers
115 views

String reverse and pairing reversed words

These are questions from an interview: Reverse a string Find matching anagrams in a word list ...
1
vote
2answers
56 views

Implement StringBuilder

I was asked this in an interview yesterday. I could add whatever methods, members and constructors I wanted but I couldn't change the signature of the provided ...
5
votes
4answers
308 views

Finding overlapping time intervals

You have two lists with meetings scheduling (start time, end time). Meetings in single list don't intersect. Find all intersecting meetings across the two lists. Is my complexity \$O(N M)\$? If I ...
1
vote
1answer
109 views

Graph Creation and BFS + DFS in C#

I was asked to implement a graph and BFS and DFS. Please comment. Is it understandable? Is my algorithm correct? Are there any optimizations? ...
1
vote
1answer
52 views

Binary search using recursion, iteration, shifted array

Interview question some engineer, asked me to write binary search in 2 ways, Also asked me to write binary search on a shifted array (10 20 1 2 3 4). Wrote that and then asked me to find the offset ...
5
votes
3answers
147 views

Square root implementations

The question was: Write a function that calculates the root of a given number. Answer A = I wrote it for integers. just run up to half of the number Answer B+C = are for double, using Newton's ...
6
votes
3answers
309 views

One character diff - string comparison

The question was: Create an algorithm to check if two strings differ by one character. This wasn't my interview, so I tried to understand the question. Options: just compare the chars one by ...
1
vote
1answer
79 views

Largest subarray with sum equal to 0

This is a typical interview question: Given an array that contains both positive and negative elements without 0, find the largest subarray whose sum equals 0. I am not sure if this will satisfy ...
6
votes
1answer
68 views

Task scheduler coding exercise

In an interview about multithreading I was asked to write code to satisfy the requirements below. In the exercise you need to provide implementation of single-threaded TaskScheduler class with the ...
5
votes
4answers
139 views

Stack with a minimum

A practice interview question: How would you design a stack which, in addition to push and pop, also has a function getMin which returns the minimum element? Push, pop and min should all operate ...
0
votes
1answer
49 views

Matrix: Set a row/col to zero

A practice interview question: Write an algorithm such that if an element in an MxN matrix is 0, its entire row and column is set to 0. ...
-1
votes
1answer
87 views

Java interview code [closed]

I was curious to anyone's thoughts, comments, and input as to something I was presented with during a job interview I went to recently. I was provided with some java code and asked to determine what ...
10
votes
4answers
846 views

Counting occurrences of each word in a sentence

I have been doing this test task for C# Developer role at UBS.London recently and have been rejected. No reason stated yet. Was wondering if you can take a look and provide feedback on what I can do ...
12
votes
4answers
936 views

O(N) vs O(N * N) for Word Frequency Algorithm

I am trying to come up with a better solution to the following problem: Statement You are supposed to write a function which takes the contents of a document in string format and also a whole ...
9
votes
2answers
140 views

Min triangle path - bottom-up

I got a bit intrigued with the recent question DP solution to min triangle path and after a certain chat message I decided that I wanted to implement my solution. Given a triangle, find the ...
6
votes
5answers
177 views

DP solution to min triangle path

I am studying for interviews for various companies. I wrote a solution to this problem, but if an experience programmer looks at it I am sure there are certain areas the code can be made in to a more ...
6
votes
5answers
681 views

Given a String, return a boolean if it is a number

Yesterday in an online interview, the interviewer asked me this question: If I give you a string, you have to return if a string is number or not. You are not allowed to use any parse function ...
3
votes
3answers
362 views

pyramid numbers in alternative reverse order

I was asked to write code for the below structure: 1 3 2 4 5 6 10 9 8 7 11 12 13 14 15 And I tried the below code, which works, yet I'm wondering ...
3
votes
1answer
138 views

Finding the longest unique sub-string in a string

I recently interviewed with a company for software engineering position. I was asked the question of finding the longest unique sub-string in a string. My algorithms was as follows: Start from the ...
8
votes
3answers
443 views

Basic string compression counting repeated characters

My task was to implement a method which performs basic string compression by counting sequences of repeating characters. Given "aaabbbccc" it should return ...
2
votes
1answer
121 views

How should I write function to print a singly linked list in a reverse order?

I am preparing for interview and I want to write the function in the way that the interviewers will expect me to write. This is my solution: ...
5
votes
2answers
764 views

Remove Nth Node from End of Linked List

I am solving the well known problem Remove Nth Node From End of List: Given a linked list, remove the n-th node from the end of list and return its head. Assume that n is between 0 and the ...
2
votes
1answer
120 views

Encoding and decoding exercise

I was issued the following coding challenge from a company to write an encoding and decoding function: Encoding: This function needs to accept a signed integer in the 14-bit range [-8192..+8191] ...
7
votes
2answers
147 views

Espresso Queue simulation

I was asked to do a technical test with the following specification, but my solution was rejected and I was not selected for the available position (Junior to "normal" level, with 4 days of time to ...
1
vote
2answers
54 views

Number of maximal PAIRS-values

I had an interview question like this: In a company there are different people. One can measure how well they suits for pair coding as follows: First, let us compute the PAIRS-value which ...
3
votes
1answer
148 views

Interview task to efficiently find compact representation of nodes in tree and find big O time

I recently had an interview problem where I was asked to find a compact representation of nodes in a tree. As an example, consider the following tree: ...
1
vote
1answer
416 views

Print all permutations of a given string in Java

I want to print all permutations of a given string in Java. To do this I create one auxiliary array boolean used[] to check if I have used some character or not. ...
5
votes
1answer
1k views

Print all possible combinations of size r, from an array of size n

This is my working solution for the following problem: given an array of integers of size n, print all possible combinations of size r. Before I proceed to the solution, I have the following ...
11
votes
3answers
288 views

Recursive, nested list traversal

Given a nested list of strings (which may contain other nested lists), print the contents of the list and the corresponding depth. Here is my solution: ...
30
votes
9answers
3k views

Which FizzBuzz is better, and why?

I was in an interview and the guy asked me to do the typical FizzBuzz question of printing numbers 1-100, but for each factor of 3 print Fizz, each factor of 5 print Buzz, and each factor of both ...
1
vote
3answers
349 views

Alternating split of a given singly linked list

Write a function AlternatingSplit() that takes one list and divides up its nodes to make two smaller lists 'a' and 'b'. The sublists should be made from alternating elements in the original list. ...
8
votes
2answers
611 views

Bowling game scorer

I was given a simple coding exercise as part of a job interview process, for which I received a negative review. This is the question: DiUS is starting a bowling club. To help with the club, we ...
10
votes
2answers
150 views

Finding the next number in sequence

I have a question to find the N th number in the sequence. 1 11 21 1211 111221 312211 13112221 1113213211 The next ...
8
votes
2answers
609 views

Animal choir simulator

I got a PHP developer interview test to solve for a company. I didn't get the job but I would like to know where I was wrong. Did I understand the test completely? ...
10
votes
1answer
294 views

Find the peak stock price for each company from CSV data

During the hiring process, a company gave me this test: Q) Consider Share prices for a N number of companies given for each month since year 1990 in a CSV file. Format of the file is as below ...
7
votes
3answers
329 views

Find two unique integers in sorted array

I have to write the following method: I have sorted array of integers and in this array every integer repeats twice, except two elements. I have to find these two elements. Input: 1, 1, 2, 3, 3, ...
10
votes
3answers
2k views

List all possible numbers from a given array that sums up to a given number

I have to solve the following problem: Given an array of integers and given an integer value, list all possible numbers frm the array that sums up to the given value. Example: Input: array = {1, 2, ...
6
votes
2answers
2k views

Binary Search Tree implementation using templates

I wrote this implementation using templates. It works fine and as expected. Just want to know if this can be improved. I have some specific questions too at the end. Please feel free to critique to ...
27
votes
10answers
3k views

What are some indicators that I was over-thinking my solution to this problem?

This question is a cross between career question and a code review. I was uncertain where to ask, but since there is code involved I went with CodeReview. I’m going through the process of technical ...
8
votes
2answers
1k views

Implementing division without addition, multiplication, division or subtraction - follow-up

This is a follow-up to this question: Division without using addition, multiplication or division Could you please tell me if there is better way of performing division without ...
0
votes
1answer
164 views

Division without using addition, multiplication or division [closed]

Could you please tell me if there is better way of performing division without +, * or /? ...
6
votes
1answer
140 views

Russian doll envelops

Interview question from the interwebz You have a set of envelopes of different widths and heights. One envelope can fit into another if and only if both the width and height of one envelope ...
4
votes
2answers
296 views

Finding the value 'n' in an array that has 'n' or more larger values

Given an unsorted array of integers, you need to return maximum possible \$n\$ such that the array consists at least \$n\$ values greater than or equals to \$n\$. Array can contain duplicate ...
6
votes
1answer
166 views

Flatten double-linked list

Consider this interview question: Given a Node with a reference to a child, its next, its previous, and a variable for its value (\$\frac{1}{2}\$ tree, \$\frac{1}{2}\$ doubly linked list ...