CMG  Collecting Mango
One day after storm mina went to pick up mangoes in the garden with a basket. She began to pick up mangoes from the garden. And if she wants, she can throw away the last picked up mango from the basket. In this way, mina kept picking up mangoes. She brought you with her to keep track of the biggest size of mango in the basket at that time. At any moment Mina can ask you about the biggest size of mango. Your job is to help Mina.
Since you are a good programmer, so you write a program by which you are easily able to answer the question of Mina.
During picking up mangoes, Mina can have 3 types of question/instruction for you.
1. Type 1: put an ‘x’ size mango in the basket, which is picked up form garden.
2. Type 2: Throw out last picked up mango. (There can be consecutive throw out operation. )
3. Type 3: Ask for the biggest mango size in the basket at that moment.
Input
The first line contains a positive integer T, number of test case. In the following each case start with a positive integer N, which is number of question/operation Mina will ask during picking up mangoes. Next N lines will contain 3 types of operations (A, R, Q). A x, here x is picked up mango size. R, throw out last picked up mango from basket. Q Find out the biggest size mango.
Output
For each case, first print the case number and print the answer of Mina’s question. Whenever the basket is empty, then Mina’s question’s answer will be “Empty”.
Constraints
 1<=T<=25
 1<=N<=100000
 1<=x<=100000
Example
Input:2
6
A 10
A 5
Q
A 100
R
Q
6
A 5
Q
R
Q
R
R Output:Case 1:
10
10
Case 2:
5
Empty
hide comments
dwij28:
20160430 17:06:28
I don't know why I am getting a WA. I have used 2 stack approach for this. Tried all the cases on spojtoolkit. Really frustrated. Can the author look into my solution please ? Last edit: 20160430 17:37:06 

Sushovan Sen:
20160430 09:35:09
O(N) algo with normal scanf/printf is giving TLE. 

Aleksandar Kostadinov:
20160428 15:12:39
Thanks, I appreciate it. 

Anick:
20160428 12:48:33
@Aleksandar Kostadinov, updated. 

Aleksandar Kostadinov:
20160428 12:16:13
What is the reason for language restriction? 

skmonir:
20160427 19:57:59
lalit_nit2 # The problem is pretty straight forward. So i don't think any tricky test case is needed here. 

lalit_nit2:
20160427 10:05:32
finally got it.......15 days to find where i was getting error :/ Last edit: 20160509 08:21:25 

Shidhu :
20160426 12:08:20
25 * 10^5 * log(10^5) is more than half second !!! 

shubhamkhara:
20160426 09:43:53
Last edit: 20160427 14:50:18 
Added by:  Anick 
Date:  20160424 
Time limit:  0.5s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: GOSU 
Resource:  Own problem. Used in NHSPC 2016 Final Round. More about NHSPC: http://www.nhspc.org/ 