Add max_Rectangle implementation in cpp#181
Add max_Rectangle implementation in cpp#181Pradeepsingh61 merged 4 commits intoPradeepsingh61:mainfrom
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Pull Request Overview
Adds a C++ implementation of the Max Rectangle problem in a binary matrix using a histogram-based stack approach, along with an in-file demo and explanatory comments.
- Implements largestRectangleArea (histogram) and maxRectangle (matrix) functions.
- Adds a main function demonstrating usage.
- Includes an algorithm and complexity explanation block.
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| int main() { | ||
| vector<vector<int>> mat = { | ||
| {1, 0, 1, 0, 0}, | ||
| {1, 0, 1, 1, 1}, | ||
| {1, 1, 1, 1, 1}, | ||
| {1, 0, 0, 1, 0} | ||
| }; | ||
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| cout << "Maximum rectangle area: " << maxRectangle(mat) << endl; | ||
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| return 0; | ||
| } |
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[nitpick] Embedding a main function inside an algorithm source file reduces reusability and can cause multiple definition issues when linking with other executables. Consider moving this demo to a separate example/test file or wrapping it in an #ifdef DEMO guard.
| * - maxRectangle: O(rows * cols), where rows and cols are the dimensions of the matrix. | ||
| * | ||
| * Space Complexity: | ||
| * - O(cols), where cols is the number of columns in the matrix due to the heights array. |
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Space complexity note is incomplete: largestRectangleArea also uses a stack that can hold up to O(cols) indices, so overall auxiliary space for maxRectangle is O(cols) for heights plus O(cols) for the stack (still O(cols), but worth clarifying). Consider revising line 71 to reflect both structures.
| * - O(cols), where cols is the number of columns in the matrix due to the heights array. | |
| * - O(cols), where cols is the number of columns in the matrix, due to the heights array and the stack used in largestRectangleArea. |
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Hi @SurajS27, welcome to our DSA code repo!
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Hi @SurajS27, I will merge this PR on 1 October, and for now, you can feel free to open PRs and issues following the guidelines here: CONTRIBUTING.md. And thank you for this PR |
This is an algorithm for a hard question named "Max Rectangle" . I have implemented this using cpp.