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Snowflake Interview Question Bank

Snowflake's loop is small and bank-driven: a recruiter screen, two back-to-back coding phone screens, then a virtual onsite that mixes coding, system design, and behavioral. The same handful of coding families (multi-source BFS on a grid, course-schedule variants, tree-node-deletion height problems, transactional KV stores) cycle through most candidates, so recognition speed matters more than novel problem solving.

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Coding·60 min
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Closest Bathroom / Desk on a Grid

Given a 2-D grid with cells marked `B` (bathroom), `D` (desk), and `_` (empty), return the shortest distance from each desk to its nearest bathroom under 4-directional movement. A 1-D variant uses `{0, 1, 2}` for empty / person / cake. Follow-ups extend to a global cake-to-person assignment.

SWE
bfs
grid
two-pointer
heap
+1
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OJ Problems

practice in the online judge
106 total
Sort Colors in a RecordCollection In-PlaceDelete a Node from a Forest Represented by Parent Index ArrayImplement a JSON ParserDistance from Each 1 to the Nearest 2 in an ArrayShortest Path in a Binary Matrix with ObstaclesHappy NumberMaximum Number of Events That Can Be Attended IIConnect Four Can Play WinParallel Courses IIIHandle Intervals When Input Is Not SortedRoot Equals Average of All SubtreesDelete Nodes in an N-ary Tree with Children Reattached; Compute Resulting HeightNearest Bathroom Distance for Each Desk in a Grid (Multi-source BFS)Max Height of a Tree Skipping Deleted Nodes + Minimum Deletions to Keep Height ≤ KNearest Bathroom Distance for Each Desk in a GridMinimum Coins to Pay with Overpay and Change AllowedTop-K trending search terms with per-user de-duplicationLeetCode 1600/1610 (uncertain) with follow-upBoundary Traversal of a Full Complete Balanced Binary Tree (Variant)Topological Sort for Course Schedule with Test CasesMinimum deletions to make tree height at most NDelete nodes from a tree to maximize remaining depthPropagate allow/disallow labels on a DAG and compute effective allowed set per nodeTree node path descriptionTree height after node removalMaximize credits by selecting coursesVerify Dish Recipes with Ingredient ListMaximize Profit from Queries in a Virtual WarehouseCourse Schedule with Batch Time Calculation设计内存文件系统

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