Top 10 FAANG Coding Interview Questions Asked by Amazon and Google

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the pair of numbers in an array that adds up to a target value. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the pair of numbers in an array that adds up to a target value. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Move all zeroes in an array to the end while preserving the order of non-zero elements. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Move all zeroes in an array to the end while preserving the order of non-zero elements. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the maximum subarray sum in an integer array. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the maximum subarray sum in an integer array. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Rotate an array to the right by k positions. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Rotate an array to the right by k positions. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Merge two sorted arrays into one sorted array. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Merge two sorted arrays into one sorted array. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the majority element in an array. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the majority element in an array. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the missing number from an array containing values from 1 to n. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the missing number from an array containing values from 1 to n. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the duplicate number in an array without modifying the input. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the duplicate number in an array without modifying the input. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Return the product of array elements except self without using division. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Return the product of array elements except self without using division. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the longest consecutive sequence in an unsorted array. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the longest consecutive sequence in an unsorted array. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For arrays problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Check whether a string is a palindrome after ignoring non-alphanumeric characters. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Check whether a string is a palindrome after ignoring non-alphanumeric characters. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For strings problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.

Core Concept: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the first non-repeating character in a string. How It Works: A strong solution should clarify inputs and edge cases, choose an efficient algorithm, explain time and space complexity, and provide clean implementation steps for: Find the first non-repeating character in a string. In an interview, start with a brute-force idea if useful, then improve it using the right data structure or algorithmic pattern. Explain edge cases, complexity, and how you would test the solution. For strings problems, the interviewer usually wants to see correctness first, then efficiency and clean reasoning. Tradeoffs: Say the complexity out loud and test with one normal case plus one edge case. Production Example: Coding interviews use this pattern to evaluate whether a candidate can break down a problem and produce a reliable implementation under constraints.