Dell Interview Guide

#1. Count Binary Substrings

ArraysStringsTwo Pointers

Count the number of substrings within a binary string that have an equal number of consecutive 0s and 1s. The 0s and 1s within the substring must also be grouped consecutively.

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

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.

ArraysTwo Pointers

Somewhat likely

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

#2. Two Sum

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

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.

ArraysTwo Pointers

Group Anagrams

Given a list of words, group together all the anagrams. Anagrams are words that contain the same letters rearranged.

ArraysStrings

Somewhat likely

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

#3. Group Anagrams

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

Given a list of words, group together all the anagrams. Anagrams are words that contain the same letters rearranged.

ArraysStrings

Longest Substring Without Repeating Characters

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

If you have a Dell interview, it's unlikely that you will get this question. Dell does ask it, but it's rare

#4. Longest Substring Without Repeating Characters

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

This question is not likely to be asked in your Dell interview

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 Dell interview, it's unlikely that you will get this question. Dell does ask it, but it's rare

#5. Valid Parentheses

This question is not likely to be asked in your Dell interview

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

StringsStacks

Find the Index of the First Occurrence in a String

Find the starting index of the first occurrence of a given substring within a larger string. Return -1 if the substring is not found.

If you have a Dell interview, it's unlikely that you will get this question. Dell does ask it, but it's rare

#6. Find the Index of the First Occurrence in a String

Find the starting index of the first occurrence of a given substring within a larger string. Return -1 if the substring is not found.

This question is not likely to be asked in your Dell interview

Merge k Sorted Lists

You are given k sorted lists. Combine all of their elements into a single sorted list and return it.

Linked ListsArrays

If you have a Dell interview, it's unlikely that you will get this question. Dell does ask it, but it's rare

Hard

#7. Merge k Sorted Lists

Hard

You are given k sorted lists. Combine all of their elements into a single sorted list and return it.

Linked ListsArrays

This question is not likely to be asked in your Dell interview

Longest Palindromic Substring

Find the longest palindromic substring within a given string. A palindromic substring reads the same forwards and backward.

StringsDynamic ProgrammingTwo Pointers

If you have a Dell interview, it's unlikely that you will get this question. Dell does ask it, but it's rare

#8. Longest Palindromic Substring