Developing Algorithms Using ArrayLists

AP Computer Science A· difficulty 4/5

int[] a = {1, 2, 4, 5, 0};
// insert 3 at index 2; last slot is unused
for (int i = a.length - 1; i > 2; i--) {
  a[i] = a[i - 1];
}
a[2] = 3;
System.out.println(a[0]+" "+a[1]+" "+a[2]+" "+a[3]+" "+a[4]);

What is printed?

A
$1 2 3 4 5$
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B
$1 2 3 5 5$
C
$1 2 3 4 0$
D
$1 2 4 5 3$

Explanation

To insert at index 2, we shift elements right, starting from the end (working backward to avoid overwriting). Then we put 3 at index 2.

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