Add Maximum Subarray in C++

archive/c/c-plus-plus/maximum-subarray.cpp

@@ -0,0 +1,72 @@
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <limits>
+#include <string>
+
+void print_usage()
+{
+    std::cout << "Usage: Please provide a list of integers in the format: \"1, 2, 3, 4, 5\"\n";
+}
+
+int max_subarray_sum(const std::vector<int> &arr)
+{
+    int max_so_far = std::numeric_limits<int>::min();
+    int max_ending_here = 0;
+
+    for (int num : arr)
+    {
+        max_ending_here += num;
+
+        if (max_so_far < max_ending_here)
+        {
+            max_so_far = max_ending_here;
+        }
+
+        if (max_ending_here < 0)
+        {
+            max_ending_here = 0;
+        }
+    }
+
+    return max_so_far;
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc < 2 || std::string(argv[1]).empty())
+    {
+        print_usage();
+        return 1;
+    }
+
+    // Parse input string
+    std::vector<int> arr;
+    std::string input = argv[1];
+    std::stringstream ss(input);
+    std::string token;
+
+    while (std::getline(ss, token, ','))
+    {
+        arr.push_back(std::stoi(token));
+    }
+
+    // If less than two integers were provided
+    if (arr.size() == 1)
+    {
+        std::cout << arr[0] << "\n";
+        return 0;
+    }
+    else if (arr.empty())
+    {
+        print_usage();
+        return 1;
+    }
+
+    // Calculate maximum subarray sum
+    int result = max_subarray_sum(arr);
+
+    std::cout << result << "\n";
+
+    return 0;
+}