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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