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KadaneAlgorithm.java

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import java.util.Scanner;

/**

* Program to implement Kadane’s Algorithm to

* calculate maximum contiguous subarray sum of an array

* Time Complexity: O(n)

*

* @author Nishita Aggarwal

*

*/

public class KadaneAlgorithm {

/**

* This method implements Kadane's Algorithm

*

* @param arr The input array

* @return The maximum contiguous subarray sum of the array

*

*/

static int largestContiguousSum(int arr[]){

int i,len=arr.length,cursum=0,maxsum=Integer.MIN_VALUE;

if(len==0) //empty array

return 0;

for(i=0;i<len;i++){

cursum+=arr[i];

if(cursum>maxsum){

maxsum=cursum;

}

if(cursum<=0){

cursum=0;

}

}

return maxsum;

}

/**

* Main method

*

* @param args Command line arguments

*/

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int n,arr[],i;

n=sc.nextInt();

arr=new int[n];

for(i=0;i<n;i++){

arr[i]=sc.nextInt();

}

int maxContSum=largestContiguousSum(arr);

System.out.println(maxContSum);

sc.close();

}

}