View Code of Problem 51

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        sc.nextLine();
        int[][] matrix = new int[n][n];
        int sum = 0;
        String line;
        String[] nums;

        for(int i = 0; i < n; i ++) {
            line = sc.nextLine();
            nums = line.split(" ");
            for(int j = 0; j < n; j ++) {
                matrix[i][j] = Integer.parseInt(nums[j]);
            }
        }

        for(int i = 0; i < n; i ++) {
            for(int j = 0; j <= i; j ++) {
                sum += matrix[i][j];
            }
        }
        System.out.println(sum);
    }
}

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