java分治法求一维数组的和

以下是Java分治法求一维数组的和的代码实现：

public class DivideSum {
    public static int divideSum(int[] a, int l, int r) {
        int sum = 0;
        if (l == r) {
            return a[l];
        }
        int m = (l + r) / 2;
        int lsum = divideSum(a, l, m);
        int rsum = divideSum(a, m + 1, r);
        sum = lsum + rsum;
        return sum;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
        }
        int l = sc.nextInt();
        int r = sc.nextInt();
        int result = divideSum(a, l, r);
        System.out.println(result);
    }
}