Snowflake Software Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Solve three coding rounds
You are given three independent interview-style coding tasks. 1) Nearest cake/person in a 2D grid You are given an m x n grid of integers: - 1 = cake ...
Minimize coins with overpay and change
You have an unlimited number of coins with denominations: - 1, 5, 10, 50, 100, 200 You need to pay exactly n units to another person. You are allowed ...
Schedule prerequisite classes with retakes
Problem You are building a course-taking engine. Each course is represented as an object: - id (unique identifier) - prevCoursesList: a list of prereq...
Solve scheduling and tree path problems
You are given three separate coding problems (asked across two rounds). For each, write a function that returns the required output. Problem 1: Max cr...
Implement topological sort and tree boundary traversal
You are given two separate coding tasks. Problem A — Order courses with prerequisites You have n courses labeled 0..n-1 and a list of prerequisite pai...
Find Shortest Wiki Click Path
Implement a function that computes the minimum number of clicks needed to navigate from one wiki page to another. You are given two page URIs, start_u...
Compute effective permissions on DAG and prune tree
Problem A — Effective allow/disallow letters on a DAG You are given a directed acyclic graph (DAG) with n nodes labeled 0..n-1. Each node u contains t...
Design transactional in-memory key-value store
Problem Design and implement an in-memory key–value store that supports basic operations plus transactions. Core API Implement the following operation...
Compute nearest bathroom distance for each desk
You are given an m x n grid of characters containing only: - 'B' = bathroom - 'D' = desk - '_' = empty cell From any cell you may move one step up/dow...
Solve four OA algorithm problems
You are given four independent coding questions. 1) Count square subgrids (multiple queries) For each query, you are given two integers R and C repres...
Compute height of tree with deleted nodes; minimize deletions
You are given a rooted tree (not necessarily binary). Each node has a list of children. Some nodes are marked as deleted = true. Define the effective ...
Find Shortest Grid Path
You are given an m x n grid where 0 represents an open cell and 1 represents a blocked cell. You are also given a start cell (sr, sc) and a target cel...
Compute total time to finish all courses
Problem You are given n courses labeled 1..n. Each course i takes time[i] units of time to complete. You are also given prerequisite relations prereqs...
Maximize revenue by choosing one query type
You are given a virtual warehouse that can execute queries. There are n query types, and you must choose exactly one query type to run repeatedly for ...
Check if each recipe is a contiguous subsequence
You are given: - An ordered ingredient list ingredients[0..n-1]. - A list of m recipes. Each recipe recipes[j] is itself a list of ingredients and is ...
Validate an extended tic-tac-toe state
Problem You are given a 3×3 tic-tac-toe board state as an array of 3 strings, each of length 3. Each cell is one of: - 'X' (player X) - 'O' (player O)...
Implement course scheduling and rate limiter analysis
You are given two independent coding problems. --- Problem 1: Course Scheduling You are planning to take a set of courses and are given prerequisite r...
Find longest substring with at most k distinct
Given a string s and an integer k, return the length of the longest contiguous substring that contains at most k distinct characters. Provide an O(n) ...
Serialize and deserialize a dictionary trie
Design and implement serialization and deserialization for a trie that stores a large dictionary of words. Requirements: compact wire format; explicit...
Check balanced parentheses with multiple bracket types
Given a string containing only parentheses '()', determine whether it is balanced. Follow-up: extend the solution to also support '[]' and '{}' with c...