GNYR04C - Lennys Lucky Lotto Lists

Lotto is a lottery, typically with an accumulating jackpot, in which participants play numbers of their choice in a random drawing. Lenny likes to play the lotto in Lincoln county Louisiana. In the game, he picks a list of n numbers in the range from 1 to m. If his list matches the drawn list, he wins the big prize, a lifetime supply of large lemons.

Lenny has a scheme that he thinks is likely to be lucky. He likes to choose his list so that each number in it is at least twice as large as the one before it. So, for example, if n = 4 and m = 10, then the possible lucky lists Lenny could pick are:

    1 2 4 8
    1 2 4 9
    1 2 4 10
    1 2 5 10

Thus Lenny has 4 lists to choose from.

Your job, given n and m, is to count how many lucky lists Lenny has to his disposal.


The first line of input is a single non-negative integer, which is the number of data sets to follow. All data sets should be handled identically. The next lines, one per data set, contain two integers, nand m. It is guaranteed that 1 <= n <= 10 and 1 <= m <= 2000 and n <= m.


For each data set, print a line like the following:

Data set in m number

where i is the data set number (beginning with 1), and number is the maximum number of lucky lists corresponding to the provided values of n and m.



4 10


Data set 1: 4 10 4

hide comments
nadstratosfer: 2017-10-28 04:13:19

Beware of blanklines in input.

Sigma Kappa: 2017-08-19 23:42:34

Speaking of DP, why it is that when I click on the "#Dynamic-Programming" tag I always end up with the same list which, for example, does not have this particular task in it? And when the "Coming-soon" feature of SPOJ will indeed come?

vengatesh15: 2017-02-07 13:16:48


ashish22_dwd: 2016-09-13 20:47:42

Yesss.. Nice trick :)

Naman Goyal: 2015-05-26 18:02:08

Result requires and fits in 8 byte. Doesn't fit in 4 byte.

pingal tirkey: 2015-05-24 08:21:45

DP :)

shikhar jindal: 2015-04-15 18:40:29

anyone please provide me with some tricky test cases..

Apoorv Jindal: 2013-12-16 18:04:02

O(10*2000+t) :)

Last edit: 2013-12-16 18:04:30
albertg: 2013-09-22 15:46:01


Vedernikoff Sergey: 2013-08-23 13:14:56

O(10 * 2000 + #testcases) for all testcases

Added by:abdelkarim
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:ACM Regionals 2004 North America - Greater NY