Implement Segment Tree with in-place
Last updated: April 5, 2026
Quick Overview
Implement a Segment Tree in-place that allows for efficient range queries and updates. Your implementation should support operations such as querying the sum of elements in a given range and updating the value of a specific element, all while using minimal additional space. The input will consist of an array of integers and a series of queries, and the output should return the results of the range queries.
Atlassian
April 5, 202634
8
1,247 solved
Implement a Segment Tree in-place that allows for efficient range queries and updates. Your implementation should support operations such as querying the sum of elements in a given range and updating the value of a specific element, all while using minimal additional space. The input will consist of an array of integers and a series of queries, and the output should return the results of the range queries.
This coding problem is frequently asked during Phone Screen at Atlassian. The interviewer is testing your ability to translate a problem into clean, working code while discussing time and space complexity. Atlassian 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
- What if the input doesn't fit in memory?
- What is the worst-case input for your solution?
- What happens if the input contains duplicates?
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Problem Analysis
To solve this problem, we need to implement a Segment Tree in-place to efficiently handle range sum queries and updates on an array of integers. A Segment Tree is suitable here because it allows both ...
Approach
- Building the Segment Tree: We will store the segment tree in the same array. The root will be at index 0, and the left and right children of the node at index
iwill be at indices2*i + 1a...
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