Create tsst.cpp

[VarunVoruganti15]

Summary by CodeRabbit

• New Features
  • Added maximum subarray sum calculation functionality to compute the highest possible sum within a contiguous sequence of array elements.

[coderabbitai]

Walkthrough

A new C++ source file tsst.cpp is introduced implementing a brute-force maximum subarray sum algorithm. The implementation includes a function that evaluates all possible subarrays to determine the maximum sum, along with a main function that demonstrates the algorithm with a sample input vector.

Changes

Cohort / File(s)	Change Summary
New implementation file tsst.cpp	Added maxSubarraySum() function using nested loops to compute maximum subarray sum; added main() function with sample vector {2, 3, -8, 7, -1, 2, 3} and output statement

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Algorithm implementation is straightforward with basic nested-loop structure
• Limited scope (single new file with ~20 lines of logic)
• Verify algorithm correctness for edge cases (negative values, single element arrays)
• Confirm proper vector initialization and loop bounds

Poem

🐰 A brute-force hop through subarrays we go,
Finding maximum sums, high and low,
Nested loops dance with vectors so neat,
From negatives deep to the summits we greet!

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "Create tsst.cpp" is directly and accurately related to the main change in the changeset. The primary change is indeed the creation of a new C++ source file named tsst.cpp containing a maximum subarray sum implementation. The title is concise, clear, and specific enough that a developer scanning the repository history would understand that a new file is being added. While the title could be more descriptive about the file's purpose (e.g., including "maximum subarray sum"), it adequately conveys the core action and artifact being introduced.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🧹 Nitpick comments (3)

tsst.cpp (3)

4-4: Avoid using namespace std; in production code.

While convenient, using namespace std; can lead to name collisions and makes code less maintainable. Consider using explicit std:: prefixes or specific using declarations instead.

Apply this diff to remove the blanket namespace declaration:

-using namespace std;

And update the code to use explicit std:: prefixes:

-int maxSubarraySum(vector<int> &arr) {
+int maxSubarraySum(std::vector<int> &arr) {
     int res = arr[0];
   
     // Outer loop for starting point of subarray
   	for(int i = 0; i < arr.size(); i++) {
     	int currSum = 0;
       
         // Inner loop for ending point of subarray
         for(int j = i; j < arr.size(); j++) {
         	currSum = currSum + arr[j];
           
             // Update res if currSum is greater than res
-            res = max(res, currSum);
+            res = std::max(res, currSum);
         }
     }
     return res;
 }
 
 int main() {
-    vector<int> arr = {2, 3, -8, 7, -1, 2, 3};
-    cout << maxSubarraySum(arr);
+    std::vector<int> arr = {2, 3, -8, 7, -1, 2, 3};
+    std::cout << maxSubarraySum(arr) << std::endl;
     return 0;
 }

---

6-22: Consider Kadane's algorithm for O(n) time complexity.

The current brute-force approach has O(n²) time complexity. Kadane's algorithm solves the maximum subarray sum problem in O(n) time, making it significantly more efficient for large inputs.

Here's an implementation using Kadane's algorithm:

int maxSubarraySum(vector<int> &arr) {
    if (arr.empty()) {
        return 0;
    }
    
    int maxSoFar = arr[0];
    int maxEndingHere = arr[0];
    
    for (int i = 1; i < arr.size(); i++) {
        maxEndingHere = max(arr[i], maxEndingHere + arr[i]);
        maxSoFar = max(maxSoFar, maxEndingHere);
    }
    
    return maxSoFar;
}

---

26-26: Add newline to output for better readability.

The output statement is missing a newline, which can make terminal output harder to read, especially when multiple programs run in sequence.

Apply this diff:

-    cout << maxSubarraySum(arr);
+    cout << maxSubarraySum(arr) << endl;

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between bd82fef and b114049.

📒 Files selected for processing (1)

• tsst.cpp (1 hunks)

🧰 Additional context used

🪛 Clang (14.0.6)

tsst.cpp

[error] 1-1: 'iostream' file not found

(clang-diagnostic-error)

[coderabbitai]

⚠️ Potential issue | 🔴 Critical

Critical: Add bounds check before accessing arr[0].

Accessing arr[0] without verifying the array is non-empty causes undefined behavior and will crash on empty input.

Apply this diff to add a bounds check:

 int maxSubarraySum(vector<int> &arr) {
+    if (arr.empty()) {
+        return 0; // or throw an exception
+    }
     int res = arr[0];

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	int res = arr[0];
	if (arr.empty()) {
	return 0; // or throw an exception
	}
	int res = arr[0];

🤖 Prompt for AI Agents

In tsst.cpp around line 7, the code accesses arr[0] without verifying the array
has at least one element; add a bounds check that ensures the array/size is
non-empty before reading arr[0] (e.g., if size/count == 0 handle the empty case
by returning an error, throwing, or using a sensible default), and only assign
to res = arr[0] after that check; ensure any callers/return path are updated to
handle the empty-array case.

[Ayushgautam16]

commit done