Difficulty Level: Basic

Submissions: 9681 Accuracy:


Implement Queue using Linked List (Function Problem)

Implement a Queue using Linked List.

Input (To be used for Expected Output):

The first line of the input contains an integer 'T' denoting the number of test cases. Then T test cases follow.
First line of each test case contains an integer Q denoting the number of queries . 
A Query Q is of 2 Types
(i) 1 x   (a query of this type means  pushing 'x' into the queue)
(ii) 2     (a query of this type means to pop element from queue and print the poped element)

The second line of each test case contains Q queries seperated by space.

The output for each test case will  be space separated integers having -1 if the queue is empty else the element poped out from the queue . 
You are required to complete the two methods push which take one argument an integer 'x' to be pushed into the quee  and pop which returns a integer poped out from othe queue.



1 2 1 3 2 1 4 2   

2 3


In the first test case for query 
1 2    the quee will be {2}
1 3    the queue will be {2 3}
2       poped element will be 2 the queue will be {3}
1 4    the queue will be {3 4}
2       poped element will be 3 

Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal
Author: Shubham Joshi 1

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