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Qualcomm Interview Guide

Showing 50 questions

Ranking

A question's ranking corresponds to how commonly it's asked by Qualcomm. The higher the ranking, the more likely you'll encounter it in a Qualcomm interview.

Question

Frequency

Difficulty

String Compression III

You are given a string and a budget for removing characters. Your goal is to compress the string as much as possible after removing at most k characters. Find the length of the shortest possible compressed string.

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

#1. String Compression III

You are given a string and a budget for removing characters. Your goal is to compress the string as much as possible after removing at most k characters. Find the length of the shortest possible compressed string.

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

Maximum Number of Ones

You are given dimensions of a grid and constraints on the number of cells you can select and the maximum side length of a selected square. Find the maximum number of ones you can cover by selecting squares within the grid.

Greedy Algorithms

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

#2. Maximum Number of Ones

You are given dimensions of a grid and constraints on the number of cells you can select and the maximum side length of a selected square. Find the maximum number of ones you can cover by selecting squares within the grid.

Greedy Algorithms

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

Reverse Linked List

You are given the head of a singly linked list. Reverse the list and return the new head.

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

#3. Reverse Linked List

You are given the head of a singly linked list. Reverse the list and return the new head.

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

You are given a square matrix representing an image. Rotate the image by 90 degrees clockwise in-place.

ArraysTwo Pointers

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

#4. Rotate Image

You are given a square matrix representing an image. Rotate the image by 90 degrees clockwise in-place.

ArraysTwo Pointers

This question is very likely to be asked in your Qualcomm 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 ListsDesign

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

#5. 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 ListsDesign

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

Remove Nth Node From End of List

You're given a linked list, and need to remove the node that is N nodes away from the end. Be careful to handle edge cases like removing the head!

Linked ListsTwo Pointers

Somewhat likely

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

#6. Remove Nth Node From End of List

You're given a linked list, and need to remove the node that is N nodes away from the end. Be careful to handle edge cases like removing the head!

Linked ListsTwo Pointers

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

You're given an integer; reverse the order of its bits. Treat the integer as an unsigned 32-bit number.

Bit Manipulation

Somewhat likely

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

#7. Reverse Bits

You're given an integer; reverse the order of its bits. Treat the integer as an unsigned 32-bit number.

Bit Manipulation

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

Number of Islands

Given a grid representing land and water, count the number of distinct islands. An island is formed by connected land cells.

Somewhat likely

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

#8. Number of Islands

Given a grid representing land and water, count the number of distinct islands. An island is formed by connected land cells.

This question is somewhat likely to be asked in your Qualcomm 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

Somewhat likely

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

#9. 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

This question is somewhat likely to be asked in your Qualcomm 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

Somewhat likely

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

#10. 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

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

Merge Sorted Array

You are given two sorted integer arrays. Merge the second array into the first one, maintaining the sorted order.

ArraysTwo Pointers

Somewhat likely

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

#11. Merge Sorted Array

You are given two sorted integer arrays. Merge the second array into the first one, maintaining the sorted order.

ArraysTwo Pointers

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

Majority Element

Find the element that appears more than n/2 times in a given array of size n. Essentially, you need to identify the majority element.

ArraysBit Manipulation

Somewhat likely

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

#12. Majority Element

Find the element that appears more than n/2 times in a given array of size n. Essentially, you need to identify the majority element.

ArraysBit Manipulation

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

Swap Nodes in Pairs

Reverse the order of each pair of adjacent nodes in a linked list. Return the modified list.

Linked ListsRecursion

Somewhat likely

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

#13. Swap Nodes in Pairs

Reverse the order of each pair of adjacent nodes in a linked list. Return the modified list.

Linked ListsRecursion

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

Valid Parentheses

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

Somewhat likely

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

#14. Valid Parentheses

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

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

Number of 1 Bits

Determine the number of '1' bits present in the binary representation of a given integer. Essentially, count how many bits are set to one.

Bit Manipulation

Somewhat likely

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

#15. Number of 1 Bits

Determine the number of '1' bits present in the binary representation of a given integer. Essentially, count how many bits are set to one.

Bit Manipulation

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

Count Array Pairs Divisible by K

Given an array of integers, determine how many pairs of numbers in the array have a product that is divisible by a given integer k. Count all such pairs and return the total.

ArraysGreedy Algorithms

Somewhat likely

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

#16. Count Array Pairs Divisible by K

Given an array of integers, determine how many pairs of numbers in the array have a product that is divisible by a given integer k. Count all such pairs and return the total.

ArraysGreedy Algorithms

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

Design Memory Allocator

Simulate a basic memory allocator. You'll need to allocate blocks of memory, track their IDs, and free them based on their ID.

ArraysTwo PointersSliding Windows

Somewhat likely

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

#17. Design Memory Allocator

Simulate a basic memory allocator. You'll need to allocate blocks of memory, track their IDs, and free them based on their ID.

ArraysTwo PointersSliding Windows

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

Palindrome Number

Determine whether an integer is a palindrome. That is, it reads the same forwards and backward.

Bit Manipulation

Somewhat likely

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

#18. Palindrome Number

Determine whether an integer is a palindrome. That is, it reads the same forwards and backward.

Bit Manipulation

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

Maximum Subarray

Find the contiguous subarray within a given array of numbers which has the largest sum. Return the sum of this subarray.

ArraysDynamic ProgrammingGreedy Algorithms

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

#19. Maximum Subarray

Find the contiguous subarray within a given array of numbers which has the largest sum. Return the sum of this subarray.

ArraysDynamic ProgrammingGreedy Algorithms

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

Calculate x raised to the power of n. Be mindful of potential edge cases and optimize for efficiency, as a naive approach might not be sufficient.

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

#20. Pow(x, n)

Calculate x raised to the power of n. Be mindful of potential edge cases and optimize for efficiency, as a naive approach might not be sufficient.

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

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