18 questions · from 3 interviews
Zs Associates interview questions
Every question candidates reported from their Zs Associates interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Zs Associates coding and DSA questions
- 01
Merge Two Sorted Lists
Given two sorted singly linked lists, merge them into a single sorted linked list and return its head.
Easy · From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 02
Merge K Sorted Lists
Given an array of k sorted singly linked lists, merge them into one sorted linked list and return its head.
Hard · From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 03
Employees Who Left the Company
From the Employees and Managers tables, list all employees whose manager has left the company.
Medium · From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 04
SQL - Top Salaries by Department
Write a SQL query to find the top salary (or salaries) for each department.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
- 05
SQL - Fifth Highest Salary Within a Department
Write a SQL query to find the fifth highest salary in each department.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
- 06
SQL - Duplicate Email Addresses
Write a SQL query to identify duplicate email addresses in an employee table.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
- 07
Grid DP Maximum Path Sum Variant
A grid-based dynamic programming problem, similar to LeetCode's Minimum Path Sum, but the objective was to find the maximum path sum instead of the minimum.
Medium · From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
- 08
Middle of the Linked List
Find the middle node of a given singly linked list.
From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
- 09
Longest Palindromic Substring
Given a string s, return the longest palindromic substring in s.
From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
- 10
First Non-Repeating Character in a String
Find the first non-repeating character in a given string and return its index. If it does not exist, return -1.
From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
Zs Associates system design questions
- 01
Asia Cup Database Schema Design
Design an end-to-end database schema for the Asia Cup, including entities, relationships, and attributes. Subsequently, write multiple queries based on the designed schema and discuss DBMS concepts and trade-offs related to the design.
From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
Zs Associates behavioural and HR questions
- 01
Guesstimate - Number of Planes Taking Off from India Annually
Estimate the total number of planes that take off from India in a year.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
- 02
Guesstimate - Number of Phones Sold in India Annually
Estimate the total number of mobile phones sold in India each year.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
Zs Associates other questions
- 01
Academic Block Lift Guesstimate
Estimate the number of lift trips made between 8 AM and 9 AM on weekdays for an academic block.
From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 02
College Electricity Bill Guesstimate
Estimate the daily electricity bill for a college campus.
From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 03
Three Switches Three Bulbs Puzzle
Three switches are inside a dark room and control three bulbs outside. Determine which switch controls which bulb by exiting the room only once.
From ZS Associates | BTSA | Tech | Interview Experience | 2026
- 04
Two Candle Puzzle - Measure 45 Minutes
You have two candles that each take exactly 60 minutes to burn completely, but they do not burn at a uniform rate. Using only these candles and a way to light them, measure exactly 45 minutes.
From How I Cracked ZS Associates (BTSA) : My Journey from LeetCode to a 14.2 LPA Offer
- 05
Two Cubes Make a Calendar Puzzle
Solve the 'Two cubes make a calendar' puzzle. This puzzle involves arranging digits on two cubes such that any date from 01 to 31 can be formed using the faces of the cubes.
From Interview Experience || ZS Associates || Software Engineer || Pune || On-Campus
Zs Associates interview questions FAQ
What questions are asked in Zs Associates interviews?
Candidates reported 18 distinct questions across 3 Zs Associates interviews. 10 coding and DSA questions, 1 system design questions, 2 behavioural and HR questions, 5 other questions.