题解 | 二维数组求和

import java.util.Arrays;
public class Main {
    public static void main(String[] args) {
        int[][]  arr = {{11, 33, 55}, {22, 44, 66, 88}, {131, 214, 315, 146}, {928, 827, 726, 625}, {424, 525}};
        int sum = add(arr);
        System.out.println(sum);
    }

    public static int add(int[][] arr) {
        int sum = 0;

        //write your code here......
        sum = (int)Arrays.stream(arr).mapToInt((subarr)-> {
            return (int)(Arrays.stream(subarr).summaryStatistics().getSum());
        }).summaryStatistics().getSum();

        return sum;
    }
}