C++ Program to Implement Kadane’s Algorithm

Smita Kapse

Answered 7h 6m ago

Kadane’s algorithm is used to find out the maximum subarray sum from an array of integers. Here we shall discuss a C++ program to implement this algorithm.

Algorithm

Begin
Function kadanes(int array[], int length):
   Initialize
   highestMax = 0
   currentElementMax = 0
   for i = 0 to length-1
      currentElementMax = max(array[i],currentElementMax + array[i])
      highestMax = max(highestMax, currentElementMax)
   return highestMax
End

Example

#include<iostream>
using namespace std;
int kadanes(int array[],int length) {
   int highestMax = 0;
   int currentElementMax = 0;
   for(int i = 0; i < length; i++){
      currentElementMax =max(array[i],currentElementMax + array[i]) ;
      highestMax = max(highestMax,currentElementMax);
   }
   return highestMax;
}
int main() {
   cout << "Enter the array length: ";
   int l;
   cin >> l;
   int arr[l];
   cout << "Enter the elements of array: ";
   for (int i = 0; i < l; i++) {
      cin >> arr[i];
   }
   cout << "The Maximum Sum is: "<<kadanes(arr,l) << endl;
   return 0;
}

Output

Enter the array length: 7
Enter the elements of array:
-1
-2
-3
-4
-5
6
7
The Maximum Sum is: 13