Top 10 amazon coding interview questions types.

Question

Design Gurus · Accepted Answer

Here is a list of common types of coding problems that are often asked in Amazon interviews. These problems are representative of the kinds of challenges that test your problem-solving and coding skills:

Array and String Manipulation:

Find the longest substring without repeating characters.
Merge two sorted arrays.

Linked Lists:

Reverse a linked list.
Detect a cycle in a linked list.

Trees and Graphs:

Check if a binary tree is a binary search tree.
Implement a graph traversal algorithm (like BFS or DFS).

Dynamic Programming:

Find the longest increasing subsequence.
Compute the number of ways to decode a message encoded as a number string (similar to the "Decode Ways" problem).

Sorting and Searching:

Implement a quicksort or mergesort algorithm.
Find the kth largest element in an array.

Number Theory and Bit Manipulation:

Determine if a number is a power of two.
Count the number of set bits in an integer.

Design Questions:

Design a least recently used (LRU) cache.
Implement a data structure for a least frequently used (LFU) cache.

Recursion:

Generate all permutations of a given string.
Solve the N-Queens puzzle.

System Design Fundamentals:

Design a URL shortening service (like bit.ly).
Outline the architecture for a scalable messaging app.

Behavioral Questions (rooted in Amazon's Leadership Principles):

Describe a time when you disagreed with a decision and how you handled it.
Give an example of when you took a calculated risk.

Remember, while practicing these types of problems, it's not just about getting to the correct answer; it's also about explaining your thought process, considering edge cases, analyzing the time and space complexity of your solutions, and writing clean, maintainable code.

Ref: Coding Interview Roadmap, System Design Interview Roadmap