56 lines
1.3 KiB
Java
56 lines
1.3 KiB
Java
package DynamicProgramming;
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import java.util.Scanner;
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/**
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* Program to implement Kadane’s Algorithm to
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* calculate maximum contiguous subarray sum of an array
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* Time Complexity: O(n)
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*
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* @author Nishita Aggarwal
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*/
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public class KadaneAlgorithm {
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/**
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* This method implements Kadane's Algorithm
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*
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* @param arr The input array
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* @return The maximum contiguous subarray sum of the array
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*/
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static int largestContiguousSum(int arr[]) {
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int i, len = arr.length, cursum = 0, maxsum = Integer.MIN_VALUE;
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if (len == 0) //empty array
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return 0;
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for (i = 0; i < len; i++) {
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cursum += arr[i];
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if (cursum > maxsum) {
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maxsum = cursum;
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}
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if (cursum <= 0) {
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cursum = 0;
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}
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}
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return maxsum;
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}
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/**
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* Main method
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*
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* @param args Command line arguments
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*/
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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int n, arr[], i;
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n = sc.nextInt();
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arr = new int[n];
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for (i = 0; i < n; i++) {
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arr[i] = sc.nextInt();
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}
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int maxContSum = largestContiguousSum(arr);
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System.out.println(maxContSum);
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sc.close();
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}
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}
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