Other Data Scientist Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Prove reservoir sampling correctness
Design an algorithm to sample k items uniformly at random from a stream of unknown and potentially massive length N, using O(k) memory and one pass. (...
Implement multiplication without using the multiplication operator
Implement int multiply(int a, int b) without using * or /. You may use +, −, bitwise operators, and shifts. Requirements: - Handle negatives, zero, an...
Implement KNN from scratch
Without using ML libraries, implement k-Nearest Neighbors for classification. Requirements: (a) Support Euclidean and cosine distances; (b) Allow tie-...
Write mini-batch gradient descent
Implement a generic mini-batch gradient descent routine: inputs are differentiable loss L(θ; x), initial θ0, batch size b, steps T, and learning-rate ...
Check if a numeric string is divisible by 8
Problem You are given a very large non-negative integer represented as a string s (it may be too large to fit in standard integer types). Write a func...
Find two numbers that sum to target
Problem You are given an integer array nums (length n) and an integer target. Return the indices (i, j) such that: - i != j - nums[i] + nums[j] == tar...
Check if huge integer string is divisible by 8
You are given a very large non-negative integer represented as a decimal string s (it may be too large to fit in 64-bit types). Determine whether the ...
Find two numbers summing to target
Given an array of integers nums (length n) and an integer target, return the indices (i, j) such that nums[i] + nums[j] == target. Constraints/assumpt...