Reverse Stack Using Recursion

Easy

0/40

Average time to solve is 21m

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351 upvotes

Asked in companies

Problem statement

Reverse a given stack of 'N' integers using recursion. You are required to make changes in the input parameter itself.

Note: You are not allowed to use any extra space other than the internal stack space used due to recursion.

Example:

Input: [1,2,3,4,5] 
Output: [5,4,3,2,1]

Detailed explanation ( Input/output format, Notes, Images )

Input Format :

The first line of input contains an integer value 'N', denoting the size of the input Stack.

The second line contains 'N' single space-separated integers, denoting the stack elements, where the leftmost integer denotes the TOP element of Stack.

Output Format :

'N' single space-separated integers in a single line, where the leftmost integer denotes the TOP element of the reversed stack.

Sample Input 1 :

3
2 1 3

Sample Output 1 :

3 1 2

Explanation to Sample Input 1 :

Reverse of a give stack is 3 1 2 where first element becomes last and last becomes first.

Sample Input 2 :

2
3 2

Sample Output 2 :

2 3

Constraints :

0 <= N <= 10^3
Where 'N' is the number of elements in the given stack.

Time Limit: 1 sec

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