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Problem 1110: Data Structure - Queue

Problem ID 1110
Title Data Structure - Queue
pdf  
Description
Queue is a basic data structure. Read tutorial for more details. Your task is to implement a queue.
Input
The first line contains an integer N (1 ≤ N ≤ 30000), the number of operations.
The follow N lines contains one of the below operation:

Push x - push x into the queue, x is an signed 32-bit integer
Pop - perform queue's pop. If the queue is empty, skip this operation
Output
Print the element in the queue after all operations. If the queue is empty, print an empty line.
Sample Input 
5
Push 3
Push 4
Pop
Push 2
Push 7
Sample Output 
4 2 7
Hint
 
Last Modified 2012-06-06 17:28:59
Time Limit 1 seconds
Memory Limit 32 MB
Accepted Solutions 0
Submitted Solutions 0
Difficulty Factor 110