Implement Trie with streaming input
Last updated: February 7, 2026
Quick Overview
Implement a Trie data structure that supports inserting words and searching for prefixes with streaming input. Your solution should efficiently handle dynamic input, allowing for real-time insertion and prefix queries. Ensure that the insert and search operations run in O(m) time, where m is the length of the word or prefix being processed.
Mastercard
February 7, 20266
8
1,402 solved
Implement a Trie data structure that supports inserting words and searching for prefixes with streaming input. Your solution should efficiently handle dynamic input, allowing for real-time insertion and prefix queries. Ensure that the insert and search operations run in O(m) time, where m is the length of the word or prefix being processed.
This coding problem is frequently asked during Onsite at Mastercard. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Mastercard expects candidates to write production-quality code, not just solve the puzzle.
What the Interviewer Expects
- Identify the correct data structure and algorithm for the problem
- Write clean, bug-free code with proper variable naming
- Analyze time and space complexity correctly
- Handle basic edge cases (empty input, single element)
- Communicate your thought process while coding
Key Topics to Cover
How to Approach This
- Clarify input constraints and edge cases before writing code.
- Walk through your approach verbally and confirm with the interviewer before coding.
- Start with a brute force solution, then optimize. Mention time and space complexity.
- Test your solution with examples, including edge cases like empty input or duplicates.
- Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Possible Follow-up Questions
- How would you modify your solution to handle streaming input?
- What happens if the input contains duplicates?
- How would you parallelize this solution?
- How would you test this solution thoroughly?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to implement a Trie (prefix tree) that can handle dynamic input for both inserting words and searching for prefixes efficiently. The Trie structure is particularly suitable her...
Approach
- Define the TrieNode Class: Each node in the Trie will contain a dictionary to its children and a boolean to indicate whether it is the end of a word.
- Define the Trie Class: The Trie cl...
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