Walmart Interview Guide

If you have a Walmart interview, it's very likely that you will get this question

#1. Longest Substring Without Repeating Characters

StringsTwo PointersSliding Windows

Find the length of the longest substring within a given string that contains no repeating characters. The substring must be contiguous.

This question is very likely to be asked in your Walmart interview

LRU Cache

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

Linked ListsArrays

If you have a Walmart interview, it's very likely that you will get this question

#2. LRU Cache

This question is very likely to be asked in your Walmart interview

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

Linked ListsArrays

Valid Parentheses

Determine if a string containing parentheses is valid. A valid string has matching and properly nested opening and closing parentheses.

StringsStacks

If you have a Walmart interview, it's very likely that you will get this question

#3. Valid Parentheses

This question is very likely to be asked in your Walmart interview

Determine if a string containing parentheses is valid. A valid string has matching and properly nested opening and closing parentheses.

StringsStacks

Max Stack

Design a stack that supports push, pop, top, peekMax, and popMax operations, all in O(1) time complexity where possible. The challenge lies in efficiently tracking and retrieving the maximum value within the stack.

Stacks

If you have a Walmart interview, it's very likely that you will get this question

#4. Max Stack

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Stacks

Trapping Rain Water

Given an array representing the height of bars, calculate how much water can be trapped between them after rain. Think about finding the maximum height to the left and right of each bar.

ArraysDynamic ProgrammingTwo PointersStacks

If you have a Walmart interview, it's very likely that you will get this question

#5. Trapping Rain Water

ArraysDynamic ProgrammingTwo PointersStacks

Given an array representing the height of bars, calculate how much water can be trapped between them after rain. Think about finding the maximum height to the left and right of each bar.

This question is very likely to be asked in your Walmart interview

Merge Intervals

You are given a collection of intervals. Merge all overlapping intervals into a single interval and return the result.

If you have a Walmart interview, it's very likely that you will get this question

#6. Merge Intervals

You are given a collection of intervals. Merge all overlapping intervals into a single interval and return the result.

This question is very likely to be asked in your Walmart interview

Divide Intervals Into Minimum Number of Groups

You're given a set of intervals. The goal is to divide these intervals into the fewest possible groups, where no intervals within a group overlap.

If you have a Walmart interview, it's very likely that you will get this question

#7. Divide Intervals Into Minimum Number of Groups

You're given a set of intervals. The goal is to divide these intervals into the fewest possible groups, where no intervals within a group overlap.

This question is very likely to be asked in your Walmart interview

Word Break

Determine if a given string can be segmented into a space-separated sequence of words from a dictionary. You are given a string and a dictionary of words; can you break the string down using words from the dictionary?

StringsDynamic Programming

If you have a Walmart interview, it's very likely that you will get this question

#8. Word Break

StringsDynamic Programming

This question is very likely to be asked in your Walmart interview

Best Time to Buy and Sell Stock

You're given daily stock prices. Find the maximum profit you can make by buying and selling the stock once. You must buy before you sell.

If you have a Walmart interview, it's very likely that you will get this question

#9. Best Time to Buy and Sell Stock

You're given daily stock prices. Find the maximum profit you can make by buying and selling the stock once. You must buy before you sell.

This question is very likely to be asked in your Walmart interview

Count Elements With Maximum Frequency

Find the number of elements in an array that appear with the highest frequency. Essentially, count how many times the most frequent number occurs.

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#10. Count Elements With Maximum Frequency

Find the number of elements in an array that appear with the highest frequency. Essentially, count how many times the most frequent number occurs.

This question is very likely to be asked in your Walmart interview

Maximum Number of Tasks You Can Assign

You're given workers with varying strengths and tasks of different difficulties. Find the maximum number of tasks you can assign to workers, where a worker's strength must be greater than or equal to the task's difficulty.

ArraysGreedy AlgorithmsBinary Search

If you have a Walmart interview, it's very likely that you will get this question

#11. Maximum Number of Tasks You Can Assign

ArraysGreedy AlgorithmsBinary Search

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Number of Ways to Separate Numbers

Given a string of digits, find the number of ways to split it into valid numbers, where each number must be positive and non-decreasing.

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#12. Number of Ways to Separate Numbers

Given a string of digits, find the number of ways to split it into valid numbers, where each number must be positive and non-decreasing.

This question is very likely to be asked in your Walmart interview

Middle of the Linked List

Find the middle node of a given linked list. If the list has an even number of nodes, return the second middle node.

Linked ListsTwo Pointers

If you have a Walmart interview, it's very likely that you will get this question

#13. Middle of the Linked List

This question is very likely to be asked in your Walmart interview

Find the middle node of a given linked list. If the list has an even number of nodes, return the second middle node.

Linked ListsTwo Pointers

Find the N-th Value After K Seconds

Imagine a value changing over time based on given rules. Your task is to determine the value of this evolving number after a specific duration.

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#14. Find the N-th Value After K Seconds

Imagine a value changing over time based on given rules. Your task is to determine the value of this evolving number after a specific duration.

This question is very likely to be asked in your Walmart interview

Circular Permutation in Binary Representation

Generate a circular sequence of binary numbers of a given length, ensuring consecutive numbers differ by only one bit. You need to find a permutation that satisfies this Gray code property.

Bit Manipulation

If you have a Walmart interview, it's very likely that you will get this question

#15. Circular Permutation in Binary Representation

This question is very likely to be asked in your Walmart interview

Generate a circular sequence of binary numbers of a given length, ensuring consecutive numbers differ by only one bit. You need to find a permutation that satisfies this Gray code property.

Bit Manipulation

Count Good Triplets in an Array

Given an array, count how many triplets of numbers satisfy specific absolute difference conditions between their values. The goal is to find 'good' triplets based on these constraints.

If you have a Walmart interview, it's very likely that you will get this question

#16. Count Good Triplets in an Array

Given an array, count how many triplets of numbers satisfy specific absolute difference conditions between their values. The goal is to find 'good' triplets based on these constraints.

This question is very likely to be asked in your Walmart interview

Minimum Number of Operations to Make Arrays Similar

You're given two arrays and can perform certain operations on them to make them similar. Find the minimum number of operations needed to make the arrays have the same set of elements, considering only the parity (odd/even) of the numbers.

If you have a Walmart interview, it's very likely that you will get this question

#17. Minimum Number of Operations to Make Arrays Similar

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Search in Rotated Sorted Array

You're given a sorted array that has been rotated, and a target value. Find the index of the target value in the rotated array, or return -1 if it's not present.

ArraysBinary Search

Somewhat likely

If you have a Walmart interview, you might get this question

#18. Search in Rotated Sorted Array

This question is somewhat likely to be asked in your Walmart interview

You're given a sorted array that has been rotated, and a target value. Find the index of the target value in the rotated array, or return -1 if it's not present.

ArraysBinary Search

XOR Operation in an Array

You're given an integer n and a start number. Generate an array based on n and start, then calculate the bitwise XOR of all elements in the array.

ArraysBit Manipulation

Somewhat likely

If you have a Walmart interview, you might get this question

#19. XOR Operation in an Array

This question is somewhat likely to be asked in your Walmart interview

You're given an integer n and a start number. Generate an array based on n and start, then calculate the bitwise XOR of all elements in the array.

ArraysBit Manipulation

Two Sum

Find two numbers in a given array that add up to a specific target value, and return their indices. Essentially, you need to efficiently locate the pair that satisfies the sum requirement.

If you have a Walmart interview, you might get this question

Somewhat likely

#20. Two Sum

Find two numbers in a given array that add up to a specific target value, and return their indices. Essentially, you need to efficiently locate the pair that satisfies the sum requirement.