Create kadane's algorithm

kadane's algorithm  fix ashvish183#108

kadane's algorithm

@@ -0,0 +1,31 @@
+//kadane's algorithm
+#include <bits/stdc++.h>
+using namespace std;
+
+int maxSubarraySum(int arr[], int n) {
+    int maxi = INT_MIN; // maximum sum
+
+    for (int i = 0; i < n; i++) {
+        int sum = 0;
+        for (int j = i; j < n; j++) {
+            // current subarray = arr[i.....j]
+
+            //add the current element arr[j]
+            // to the sum i.e. sum of arr[i...j-1]
+            sum += arr[j];
+
+            maxi = max(maxi, sum); // getting the maximum
+        }
+    }
+
+    return maxi;
+}
+
+int main()
+{
+    int arr[] = { -2, 1, -3, 4, -1, 2, 1, -5, 4};
+    int n = sizeof(arr) / sizeof(arr[0]);
+    int maxSum = maxSubarraySum(arr, n);
+    cout << "The maximum subarray sum is: " << maxSum << endl;
+    return 0;
+}