42. Trapping Rain Water | LeetCode | Top Interview 150 | Coding Questions
This article discusses a coding problem from LeetCode called 'Trapping Rain Water' and provides a solution in Java.
Why it matters
This problem is a common coding interview question that tests a candidate's problem-solving skills and ability to optimize solutions.
Key Points
- 1The problem involves calculating the amount of rain water that can be trapped between vertical bars of different heights.
- 2The solution uses a two-pointer approach, tracking the maximum height on the left and right sides to determine the amount of water that can be trapped.
- 3The code iterates through the array, updating the left and right pointers and calculating the trapped water based on the current and maximum heights.
Details
The 'Trapping Rain Water' problem is a classic coding challenge that tests the ability to solve a problem using a two-pointer approach. The goal is to find the amount of rain water that can be trapped between the vertical bars of different heights. The provided solution uses a left and right pointer to track the maximum height on each side, and calculates the trapped water based on the current height and the maximum height. The algorithm iterates through the array, updating the left and right pointers and the trapped water value accordingly. This approach has a time complexity of O(n) and a space complexity of O(1), making it an efficient solution to the problem.
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