SOCOLA  Chocolate
Chocolate in its many forms is enjoyed by millions of people around the world every day. It is a truly universal candy, available in virtually every country around the world.
You find that the only thing better than eating chocolate is to share it with friends. Unfortunately, your friends are very picky and have different appetites: some would like more and others less of the chocolate that you offer them. You have found it increasingly difficult to determine whether their demands can be met. It is time to write a program that solves the problem once and for all!
Your chocolate comes as a rectangular bar. The bar consists of samesized rectangular pieces. To share the chocolate, you may break one bar into two pieces along a division between rows or columns of the bar. You may then repeatedly break the resulting pieces in the same manner. Each of your friends insists on a getting a single rectangular portion of the chocolate that has a specified number of pieces. You are a little bit insistent as well: you will break up your bar only if all of it can be distributed to your friends, with none left over.
For example, Figure 9 shows one way that a chocolate bar consisting of 3 x 4 pieces can be split into 4 parts that contain 6, 3, 2, and 1 pieces respectively, by breaking it 3 times. (This corresponds to the first sample input.)
Figure 9
Input
The input consists of multiple test cases, each describing a chocolate bar to share. Each description starts with a line containing a single integer n (1 <= n <= 15), the number of parts into which the bar is supposed to be split. This is followed by a line containing two integers x and y (1 <= x, y <= 100), the dimensions of the chocolate bar. The next line contains n positive integers, giving the number of pieces that are supposed to be in each of the n parts.
The input is terminated by a line containing the integer zero.
Output
For each test case, first display its case number. Then display whether it is possible to break the chocolate in the desired way: display "Yes" if it is possible, and "No" otherwise. Follow the format of the sample output.
Sample Input
4 3 4 6 3 2 1 2 2 3 1 5 0
Sample Output
Case 1: Yes Case 2: No
hide comments
Shrish Lal Bhatnagar:
20150528 14:48:01
can't see the figure... 

M.Amin Qiasi:
20120324 23:43:26
I've got the same problem...


!n[10]se:
20110131 22:57:12
Aced :) Last edit: 20110826 10:27:00 

Samir Ahmed:
20101022 11:19:19
can someone please check my code in the forum. I am getting TLE here. but i have ran my code against a ACCEPTED one with 800 test cases. My program ran for less than 1 seconds, where the ACCEPTED one took more than 4 seconds. I have checked with all possible GOOD cases. Pleaseeee help. 
Added by:  Duc 
Date:  20100209 
Time limit:  0.680s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: NODEJS OBJC PERL6 SQLITE VB.NET 
Resource:  ACM ICPC World Final 2010 