Questions tagged [interview-questions]

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

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6
votes
2answers
236 views

Data analysis program for job interview

Before the interview for the Junior (i hope:)) position of Java developer, I was asked to do a test task. Kindly ask you to review my code. Riht now program arguments are hardcoded and not from args[],...
6
votes
4answers
8k views

Checking balanced parenthesis string

I recently wrote a code in online recruitment test. It was very good. With each question, there were associated space and time limits check. If our code executed correctly within both limits, only ...
7
votes
2answers
171 views

Interview Code Test: Webservice Checker

I recently applied for a job as a C# developer. Based on the first phone call, they wanted to check my skills with a code interview in Java. Since I haven't programmed Java for years, I tried my best, ...
9
votes
1answer
328 views

Drone Delivery Scheduling Service

I recently did a interview with WalmartLabs. I was tasked with a take home assignment. I didn't sign a NDA and a team at WalmartLabs said I could post the code on GitHub. I was tasked with developing ...
0
votes
1answer
337 views

Insert a digit to maximize the given number

Was asked in an interview today - You are given an integer (in finite range [-N, N]) and you wish to maximize the number by inserting somewhere the digit '5'. My solution - the idea here is going ...
3
votes
1answer
109 views

Find number of horizontal brush strokes to paint a skyline

Asked in interview today: You want to paint a skyline on your wall using only horizontal brush strokes. You are given an array of numbers, each representing the size of the column/building in that ...
5
votes
2answers
94 views

Find minimal number of days to meet all your friends

I was asked this in an interview yesterday: You get an array of segments (segment contains 2 numbers, representing days count (say in a month, but could be in a year, etc.): start, end). You need to ...
1
vote
0answers
65 views

Tic-tac-toe vanilla js

I'm trying to improve my interview skills so I wrote one of the typical assignments - tic-tac-toe game. The main goals are: time limit: 30 minutes - 1h use only vanilla js I'll attach source but I ...
0
votes
1answer
61 views

Choosing between 2 Fibonacci alternatives [closed]

Task: Return the fibonacci value at a given index. e.g: input: 6, return: 8. Algorithm 1: ...
3
votes
1answer
137 views

Algorithm to find the Array Balance Point

Task: Find the balance point of an array; return the index that if you break the array into left and right at that point will ...
6
votes
2answers
3k views

Minimum swaps algorithm terminated due to timeout

I have been trying to solve this question. Given an unordered array consisting of consecutive integers [1, 2, 3, …, n], find the minimum number of two-element swaps to sort the array. I was able ...
8
votes
1answer
233 views

FizzBuzz in Csharp

For my first CodeReview, I would like to present my FizzBuzz solution in C#. My design has all of the rule logic about when to display what in separate classes through an interface. This design should ...
147
votes
18answers
28k views

Searching an element in a sorted array

I was applying for a position, and they asked me to complete a coding problem for them. I did so and submitted it, but I later found out I was rejected from the position. Anyways, I have an eclectic ...
7
votes
3answers
590 views

Inventory coding interview exercicse

This past week, I had a coding interview where I have failed badly. The feedback that I get from the recruiter was that my code reminded the team of older ways of coding in C#. This led them to ...
2
votes
1answer
221 views

LeetCode: Greatest Common Divisor of Strings C#

https://leetcode.com/problems/greatest-common-divisor-of-strings/ For strings S and T, we say "T divides S" if and only if S = T + ... + T (T concatenated with itself 1 or more times) ...
5
votes
3answers
411 views

C# Bowling Game interview test

I recently interviewed for a software engineering job that requires at least one year of C# and experience with the Microsoft stack. Even though I made it clear at the outset that I had zero ...
6
votes
3answers
503 views

Intersection of the interval set

Recently I had an interview where it was asked: Given a list of people with their birth and end years find the year with the most number of people alive. I implemented in Java and was trying to ...
6
votes
4answers
211 views

Building a toy from Lego toys

I recently attempted a coding problem, but my solution was not well received during the interview (modified slightly to reduce Google-ability). Suppose a child has several Lego blocks, and wants to ...
2
votes
1answer
224 views

Modelling a Call Center in Java (multithreading approach)

I wanted to give a shot to Modelling a Call Center from Cracking the Coding Interview. The problem statement is as follows: You have a call center with three levels of employees: Respondent, ...
1
vote
2answers
163 views

Unit tests for anagram finder

I did this test for a job and the feedback was: "while many were added to test private methods, they did not do anything to ensure the public interface worked correctly, edge cases were missed" But ...
3
votes
2answers
117 views

Parcel size classifier [closed]

I submitted a technical assignment for a job interview process and I am stressing out wondering if my submission was any good. I would like to learn and be a better developer, so please give me ...
2
votes
1answer
818 views

Time schedule intersection

I had a job interview one of the questions was the following Given an api - you submit a name of a person and it gives back a sorted list of all the free time slots this person has. the list might be ...
8
votes
2answers
701 views

Analyzing records of London Underground outages

You have a file that describes historic data of the London Underground showing dates when stations have been unavailable. The file contains these fields, separated by a pipe character: Date: ...
5
votes
1answer
146 views

Decode ambiguous Morse code

Stumbled upon this interview question: Given a morse encoded sentence with no spaces or separation between letters or words and a list of words contained in the message, decode it. This was my ...
5
votes
1answer
66 views

An alternative algorithm for sorting a stack using only one additional stack

From "Cracking the Coding Interview": Write a program to sort a stack in ascending order (with biggest items on top). You may use at most one additional stack to hold items, but you may not copy ...
4
votes
2answers
435 views

Longest Palindromic Substring better approach

I have encountered to this question and applied a brute force algorithm off top of my head and couldn't find a better optimized solution. I was hoping I could get some insight to implement a better ...
7
votes
1answer
83 views

Find neighboring PINs on a numeric keypad

I am new to coding and to apply for an internship I need to solve several tasks. This is one of them. I wrote working code, but the program says it takes too long to complete. Help me speed up my code ...
-1
votes
1answer
1k views

Maximum Difference in an Array [closed]

Maintain a minimum and max difference as we scan the input array. ...
5
votes
1answer
145 views

Call center escalation excercise, using Chain of Responsibility pattern

This is a coding interview I found online, to be solved within 30 minutes: Design an OOP concept for an application where employee can dispatch their incoming phone call according to their ...
2
votes
3answers
115 views

Reading, cleaning and parsing CSV

This project was completed as part of an interview challenge. The feedback I received was: The code is neither optimized nor does it follow generally accepted paradigms, naming conventions or best ...
3
votes
1answer
60 views

Comparing algorithms to decode a String

I am writing a function to decode a string, which means performing a string transformation like 3e4f2e --> eeeffffee. I have ...
3
votes
1answer
75 views

System Dependency Manager - Ruby

I recently got a prompt when looking for a job. To spare any details, the company decided not to get back to me, so because I did not get a code-review/feedback from them, I was wondering if someone ...
5
votes
1answer
84 views

News reading application version 2

following the answer I got from t3chb0t last time News-reading application using the Observer pattern and also following the example here https://msdn.microsoft.com/en-us/library/dd990377(v=vs.110)....
2
votes
2answers
160 views

Ruby implementation for Hacker Rank connected cells in a grid

https://www.hackerrank.com/challenges/connected-cell-in-a-grid/problem problem statement: Consider a matrix where each cell contains either a 1 or a 0. Any cell containing a 1 is called a ...
1
vote
1answer
2k views

Print odd and even numbers using two threads in Java

I was asked below question in an interview where I need to print out even and odd numbers using two threads so I came up with below code one without synchronization and other with synchronization. <...
6
votes
4answers
152 views

LeetCode ZigZag helper function code

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) ...
7
votes
5answers
7k views

Simple online auction system in Java

I recently applied for a Java developer position and I was asked to completed a coding task. After review of the coding task, the company said they do not want to take me forward to interview. They ...
13
votes
3answers
20k views

Get all combinations of selecting k elements from an n-sized array

Was asked this today in an interview. Didn't see it before, and spent quite a lot of time getting it to work (tricky with all the recursion). The goal was to find all possible combinations of ...
13
votes
1answer
1k views

Interview coding challenge for iOS Part 2 - the application in Objective-C and Swift

I recently interviewed with a company that needed a C/C++ programmer to work on the iOS side of the products. The job description indicated they needed someone with 4 years of Objective-C and iOS ...
3
votes
1answer
37 views

T-SQL Query remove duplicates except for original row from the table

Question: There is an Exam_Merge table into which to import records from a similarly structured table in another database. In this case, the Exam_Merge table contains the values of the primary key ID ...
8
votes
2answers
258 views

Function invocation every second time

Recently I got test task at the project, it is fairly simple: ...
8
votes
1answer
5k views

Highest pit - only climbing through the pit once

Problem description: A non-empty zero-indexed array A consisting of N integers is given. A pit in this array is any triplet of integers (P, Q, R) such that: 0 ≤ P < Q < R < N; ...
1
vote
1answer
80 views

T-SQL query Choose name of clients, concluded more than one loan agreement in 2010

QUESTION: Choose the name of clients, concluded more than one loan agreement in 2010, as the numbers and dates of issue of these contracts. Sort by name of the client and date of issue of the loan. ...
3
votes
2answers
296 views

Calculate the largest palindromic number from the product of two 6-digit numbers (100000 to 999999)

Are there any efficient ways to solve this problem, for example using bitwise operator? ...
4
votes
1answer
573 views

Jumping on the clouds

I have started the Hackerrank interview preparation kit. The first problem I have solved with Swift is as follows: Emma is playing a new mobile game that starts with consecutively numbered clouds. ...
7
votes
5answers
212 views

String combinations of 0 and 1

I was asked this question in an interview: Given a string s consisting of 0, 1 and ...
7
votes
6answers
1k views

Find max number you can create from an array of numbers

Was asked this in an interview yesterday: You are given an array of numbers (not digits, but numbers: e.g. 9, 23, 184, 102, etc.) - you need to construct the largest number from it. For example: you ...
3
votes
1answer
102 views

Find the largest product of an array

This task is taken from www.interviewbit.com Given an array of integers, return the highest product possible by multiplying 3 numbers from the array Input: ...
6
votes
1answer
29k views

Count duplicates in a JavaScript array

This is actually a hackerrank interview question I have already solved but I need guidance on how to optimize it for the Time Space Given an array of integers, your task is to count the number of ...
3
votes
3answers
255 views

Frequency analysis based anagram checker

I uploaded code solutions for some problems of the book Cracking the Coding Interview, 6th Edition to GitHub, I would like to know your rating and potential improvement of the code I wrote. Here is ...

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