Adding Kadane Algorithm (#606)

* Adding Kadane Algorithm

* std::cin and std::cout

* Rename Dynamic Programming/kadane algorithm.cpp to dynamic_programming/kadane.cpp

* Update kadane.cpp

* Update kadane.cpp

* // NOLINT

dynamic_programming/kadane.cpp

@@ -0,0 +1,30 @@
+#include<iostream>
+#include<climits>
+
+int maxSubArraySum(int a[], int size) {
+    int max_so_far = INT_MIN, max_ending_here = 0;
+
+    for (int i = 0; i < size; i++) {
+        max_ending_here = max_ending_here + a[i];
+        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 n, i;
+    std::cout << "Enter the number of elements \n";
+    std::cin >> n;
+    int a[n];  // NOLINT
+    for (i = 0; i < n; i++) {
+        std::cin >> a[i];
+    }
+    int max_sum = maxSubArraySum(a, n);
+    std::cout << "Maximum contiguous sum is " << max_sum;
+    return 0;
+}