Snowflake interview questions

Showing 121–130 of 130 results

• Solve Matrix and Array Distance ProblemsMedium

  Implement a multi-source breadth-first search to find the shortest path from every compute node to its nearest data warehouse in a grid with obstacles.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve and optimize 3Sum and variants at scaleMedium

  This question evaluates algorithmic problem-solving skills in array processing, deduplication and combinatorial counting, external-memory and streaming algorithm design, and complexity analysis including integer overflow considerations.

  SnowflakeData ScientistCoding & AlgorithmsOnsite
• Solve build ordering and expression evaluationMedium

  This question evaluates competency in graph algorithms (topological ordering and cycle detection) and in parsing/evaluating arithmetic expressions with correct operator precedence, associativity, unary operators, and 64-bit integer semantics.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve scheduling and tree path problemsHard

  This problem tests your ability to optimize path calculations in a tree by combining depth-first traversal with a greedy or dynamic programming approach to select paths that satisfy specific constraints.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Sort an RGB Record Collection In PlaceMedium

  This question tests the ability to partition an array into three distinct groups (Red, Green, Blue) in a single pass using constant extra space, which is a classic application of the Dutch National Flag algorithm.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Stack with Constant-Time Minimum over a Sequence of OperationsMedium

  Design a stack that supports push, pop, top and reading its current minimum in constant time, then run it over a sequence of operations and return what the reads produce. Tests data structure design, duplicate minimum values and keeping auxiliary state consistent on every pop.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Time-Versioned Key-Value Store and Time-Window Event CounterMedium

  Build a key-value store that keeps every timestamped value of a key and returns the value in effect at a given time, then a counter that answers how many events occurred in a time window. It tests binary search over histories, window semantics and memory bounds.

  SnowflakeSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Transform tree using counterpart subtree sumsMedium

  This question evaluates proficiency with binary tree algorithms and in-place subtree aggregation, emphasizing traversal strategies, shape verification, and handling subtree sums under linear-time and O(h) space constraints.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Transform tree with subtree sum mappingMedium

  Transform tree with subtree sum mapping evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen
• Traverse All Reachable Pages With Parallel BFSMedium

  Implement a concurrent breadth-first web crawler that discovers all reachable pages from a start URL. The crawler must fetch pages concurrently while maintaining deterministic level-order output and safely handling cycles and fetch errors.

  SnowflakeSoftware EngineerCoding & AlgorithmsTechnical Screen