Skip to content
Related Articles
Open in App
Not now

Related Articles

GATE | GATE-CS-2000 | Question 38

Improve Article
Save Article
  • Difficulty Level : Easy
  • Last Updated : 10 Jul, 2018
Improve Article
Save Article

Suppose you are given an array s[1..n] and a procedure reverse (s, i, j) which reverses the order of elements in a between positions i and j (both inclusive). What does the following sequence do, where 1 <= k <= n:

reverse(s, 1, k) ;
reverse(s, k + 1, n);
reverse(s, l, n); 

(A) Rotates s left by k positions
(B) Leaves s unchanged

(C) Reverses all elements of s
(D) None of the above

Answer: (A)

Explanation: Effect of the above 3 reversals for any k is equivalent to left rotation of the array of size n by k. Please see this post for details.
If we rotate an array n times for k = 1 to n, we get the same array back.

Quiz of this Question

My Personal Notes arrow_drop_up
Related Articles

Start Your Coding Journey Now!