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ISI2026-MCS-PCA | Question: 4

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Consider the following pseudo-code for reversing an array $A$.
Algorithm ReverseArray(A[l..r])
// Input: an array A[l..r]
// Output: the array A in reverse order
if ..... then
  Swap A[l] and A[r]
  REVERSEARRAY (A[l+1..r-1])

For what condition in the if clause, the above pseudo-code will correctly reverse the array $A$ ?

  1. $r \geq 0$
  2. $\ell \neq r$
  3. $l \leq r$
  4. $l < r$

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