Find the Container with the Most Water
Last updated: August 5, 2026
Quick Overview
The question asks the candidate to identify the container formed by two vertical lines that can hold the maximum amount of water, given an array of heights representing the lines.
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August 5, 20262
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The question asks the candidate to identify the container formed by two vertical lines that can hold the maximum amount of water, given an array of heights representing the lines.
This question is typically asked during the onsite coding interview round to evaluate a candidate's problem-solving skills and ability to write efficient algorithms. The interviewer is looking for the candidate to demonstrate their understanding of two-pointer techniques and optimization strategies, as well as their ability to articulate their thought process clearly.
What the Interviewer Expects
- Clearly explain the problem and approach before diving into coding.
- Utilize a two-pointer technique to optimize the solution.
- Provide a correct implementation with a focus on code efficiency.
- Discuss the time and space complexity of the solution.
- Handle edge cases and explain the reasoning behind the approach.
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 explain why the two-pointer technique is effective for this problem?
- What would be the time complexity of a brute force solution?
- How would you modify your approach if the heights were given in a different format?
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Practice DSA ProblemsSample Answer
Framing
To solve the 'Container with Most Water' problem, we need to find two lines from an array that, together with the x-axis, form a container capable of holding the maximum amount of water. The amount of...
Approach
The optimal approach to solve this problem is to use the two-pointer technique. We will initialize two pointers, one at the beginning and one at the end of the array. We will calculate the area formed...
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