15 Anti-diagonal: m[0][2]=3, m[1][1]=5, m[2][0]=7. Sum = 15.

Traversing 2D Arrays

AP Computer Science A· difficulty 4/5

int[][] m = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int sum = 0;
int n = m.length;
for (int i = 0; i < n; i++) sum += m[i][n - 1 - i];
System.out.println(sum);

What is printed?

A
$15$
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B
$21$
C
$12$
D
$9$

Explanation

Anti-diagonal: m[0][2]=3, m[1][1]=5, m[2][0]=7. Sum = 15.

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