[经典算法之数组]

佚名 6年前 (2019-04-09) 随笔 565人围观抢沙发百度已收录

数组中子数组最大和

/**
 * 求数组中最大的子数组之和 动态规划
 * 
 * @author ytuan
 *
 */
public class MaxSum {

    public static int begin = 0;
    public static int end = 0;

    public static int maxSum(int arr[]) {

        int n = arr.length;
        int start = 0;

        int nMax = 0;
        int aMax = 0;

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

            if (nMax < 0) {
                nMax = arr[i];
                start = i;
            } else {
                nMax += arr[i];
            }

            if (nMax > aMax) {
                aMax = nMax;
                begin = start;
                end = i;
            }
        }

        return aMax;

    }

    public static void main(String[] args) {
        int arr[] = { 1, 2, -5, 6, 8, -5, 9 };

        System.out.println(MaxSum.maxSum(arr));
        System.out.println(MaxSum.begin);
        System.out.println(MaxSum.end);
    }

}