Implement Trie with without recursion
Last updated: September 5, 2025
Quick Overview
Implement a Trie data structure that supports insert and search operations without using recursion. Your implementation should allow for inserting words and checking if a given word exists in the Trie. The input will consist of a list of words to insert and a list of words to search, and the output should indicate whether each search word is present in the Trie.
Brex
September 5, 202510
6
1,050 solved
Implement a Trie data structure that supports insert and search operations without using recursion. Your implementation should allow for inserting words and checking if a given word exists in the Trie. The input will consist of a list of words to insert and a list of words to search, and the output should indicate whether each search word is present in the Trie.
Coding interviews at Brex focus on problem-solving approach as much as the final solution. The interviewer wants to see you break down the problem, consider edge cases, and optimize iteratively. Communication throughout the process is key.
What the Interviewer Expects
- Recognize the underlying problem pattern (sliding window, two pointers, BFS/DFS, etc.)
- Discuss multiple approaches and trade-offs before coding
- Implement an optimal solution with clean, production-quality code
- Handle all edge cases including boundary conditions and invalid input
- Optimize both time and space complexity with clear justification
- Test your solution systematically with well-chosen examples
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
- Can you optimize the space complexity of your solution?
- What if the input doesn't fit in memory?
- How would you modify your solution to handle streaming input?
- Can you solve this in a single pass?
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Practice DSA ProblemsSample Answer
Problem Analysis
The problem requires us to implement a Trie (prefix tree) which supports insertion and search operations without recursion. The Trie is essentially a tree structure where each node represents a charac...
Approach
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Define the TrieNode Class: Create a class
TrieNodethat holds a dictionary for children nodes and a boolean to indicate if the node represents the end of a word.class Tri...
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