diff --git a/Kadane_Maximum sum subarray b/Kadane_Maximum sum subarray
new file mode 100644
index 0000000..c74c5e0
--- /dev/null
+++ b/Kadane_Maximum sum subarray	
@@ -0,0 +1,33 @@
+//Maximum Sum Subarray_O(n)
+#include<cmath>
+#include<iostream>
+#include<climits>
+using namespace std;
+
+int mss(int arr[],int n)	
+{
+	int i;
+	int ans = arr[0],sum = 0;
+	
+	for(i= 1;i < n; ++i)	
+		ans = max(ans,arr[i]);	
+	if(ans<0)					
+		return ans;
+	ans = 0;
+	for(i = 0 ;i < n; ++i)
+	{
+		if(sum + arr[i] > 0)
+			sum+=arr[i];
+		else
+			sum  = 0;
+		ans = max(ans,sum);	
+	}
+	return ans;
+}
+
+int main(int argc, char const *argv[])
+{
+	int arr[] = {3,-2,5,-1};
+	cout<<mss(arr,4)<<"\n";
+	return 0;
+}