java/dynamic-programming/Kadane.java at master · uttamrc/java · GitHub

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package AlgorithmsAndDS;

public class Kadane {

	public static void main(String[] args) {
		int[] arr = { 2, 3, -6, 1, 2, 3, -4, 5 };
		System.out.println(maximumSubArraySum(arr));
		// System.out.println(kadaneSum(arr));
	}

	public static int maximumSubArraySum(int[] arr) {
		int osum = arr[0];
		int csum = arr[0];
		for (int i = 1; i < arr.length; i++) {
			if (csum + arr[i] < arr[i]) {
				csum = arr[i];
			} else {
				csum += arr[i];
			}
			if (csum > osum) {
				osum = csum;
			}
		}
		return osum;
	}

	public static int kadaneSum(int[] arr) {
		int osum = arr[0];
		int csum = arr[0];
		for (int i = 1; i < arr.length; i++) {
			if (csum + arr[i] < arr[i]) {
				csum = arr[i];
			} else {
				csum += arr[i];
			}
			if (csum > osum) {
				osum = csum;
			}
		}

		return osum;
	}
}