STAMPS  Stamps
Everybody hates Raymond. He’s the largest stamp collector on planet earth and because of that he always makes fun of all the others at the stamp collector parties. Fortunately everybody loves Lucy, and she has a plan. She secretly asks her friends whether they could lend her some stamps, so that she can embarrass Raymond by showing an even larger collection than his. Raymond is so sure about his superiority that he always tells how many stamps he’ll show.And since Lucy knows how many she owns, she knows how many more she needs. She also knows how many friends would lend her some stamps and how many each would lend. But she’s like to borrow from as few friends as possible and if she needs too many then she’d rather not do it at all. Can you tell her the minimum number of friends she needs to borrow from?
Input
The first line contains the number of scenarios. Each scenario describes one collectors party and its first line tells you how many stamps (from 1 to 1000000) Lucy needs to borrow and how many friends (from 1 to 1000) offer her some stamps. In a second line you’ll get the number of stamps (from 1 to 10000) each of her friends id offering.
Output
The output for every scenario begins with a line containing “Scenario #i:”, where i is the number of the scenario starting at 1. Then print a single line with the minimum number of friends Lucy needs to borrow stamps from. If it’s impossible even if she borrows everything from everybody, write impossible. Terminate the output for the scenario with a blank line.
Example
Input: 3 100 6 13 17 42 9 23 57 99 6 13 17 42 9 23 57 1000 3 314 159 265 Output: Scenario #1: 3 Scenario #2: 2 Scenario #3: impossible
hide comments
alisabry:
20160328 22:04:15
what means internal error? 

azzammohamed:
20160310 21:32:39
i really don't understand this problem :( can any one help


gurugs:
20160228 20:02:53
got WA for printing "Scenario #1" instead of "Scenario #1:" 

harshpreet:
20160120 19:03:02
Don't forget to print scenario# : cost me 3WA


wh1t3_r0s3:
20160117 20:16:44
easy one ! got AC in one go


akshayvenkat:
20160112 05:05:23
print "impossible" and not "Impossible" _ . Simple problem with rather cumbersome output formatting :3 

abc_c:
20160107 15:02:08
Silly Mistake Casue 2 WA


sumit suthar:
20151105 05:56:40
Very Easy just sort.. ;) 

Amanpreet Singh:
20150829 08:55:38
AC in one go...Very easy one.. :P


sidk2496:
20150827 21:08:10
Sorting should do the trick!! 
Added by:  Daniel Gómez Didier 
Date:  20081117 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO 
Resource:  2007  Circuito de Maratones ACIS / REDIS 