IITKWPCO - Create Collections

  Little Feluda likes to play very much. As you know he only plays with numbers. So he is given n numbers. Now tries to group the numbers into disjoint collections each containing two numbers. He can form the collection containing two numbers iff small number in the collection is exactly half of large number.

  Given n numbers, Find out how many maximum number of collections he can form ?


T: number of test cases. (1 <= T <= 100).

For each test case:

First line will contain n :  (1 <= n <= 100)

Then next line will contain n numbers single space seperated. Range of each number will be between 1 and 10^6.


For each test case, output maximum number of collections that can be formed.


1 2
1 2 4

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Ayush Nigam: 2014-06-30 21:11:40

o(nlogn) and with much optimisation :D:D

UnrealNinja: 2014-06-30 21:11:40

Test File is poorly created.
Integers are not single space separated. There may be more than one space between integers in the list.

கைபுள்ள: 2014-06-30 21:11:40

don't divide. use multiplication cause 2 WA :(

Bhavik: 2014-06-30 21:11:40

ac in 1st attempt:)
nothing new in this problem

Prakhar Gupta: 2014-06-30 21:11:40

too easy.... :)

wa: 2014-06-30 21:11:40

u can post your query on spoj forum

Last edit: 2013-09-03 18:58:33
viki: 2014-06-30 21:11:40

python i m still getting wrong ans..plz help me..

viki: 2014-06-30 21:11:40

i m getting all test cases correct still getting wa..plz help...is there any trick in this ques..?

Karthikeyan.k: 2014-06-30 21:11:40

Passed all test cases...Still not AC :(
Plz help

Added by:praveen123
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:IITK ACA CSE online judge