Sphere Online Judge

SPOJ Problem Set (classical)

36. Secret Code

Problem code: CODE1

The Sarcophagus itself is locked by a secret numerical code. When somebody wants to open it, he must know the code and set it exactly on the top of the Sarcophagus. A very intricate mechanism then opens the cover. If an incorrect code is entered, the tickets inside would catch fire immediately and they would have been lost forever. The code (consisting of up to 100 integers) was hidden in the Alexandrian Library but unfortunately, as you probably know, the library burned down completely.

But an almost unknown archaeologist has obtained a copy of the code something during the 18th century. He was afraid that the code could get to the ``wrong people'' so he has encoded the numbers in a very special way. He took a random complex number B that was greater (in absolute value) than any of the encoded numbers. Then he counted the numbers as the digits of the system with basis B. That means the sequence of numbers an, an-1, ..., a1, a0 was encoded as the number X = a0 + a1B + a2B2 + ...+ anBn.

Your goal is to decrypt the secret code, i.e. to express a given number X in the number system to the base B. In other words, given the numbers X and Byou are to determine the ``digit'' a0 through an.


The input consists of T test cases (equal to about 100000). The number of them (T) is given on the first line of the input file. Each test case consists of one single line containing four integer numbers Xr, Xi, Br, Bi (|Xr|,|Xi| <= 1000000, |Br|,|Bi| <= 16). These numbers indicate the real and complex components of numbers X and B, i.e. X = Xr + i.Xi, B = Br + i.Bi. B is the basis of the system (|B| > 1), X is the number you have to express.


Your program must output a single line for each test case. The line should contain the ``digits'' an, an-1, ..., a1, a0, separated by commas. The following conditions must be satisfied:

  • for all i in {0, 1, 2, ...n}: 0 <= ai < |B|
  • X = a0 + a1B + a2B2 + ...+ anBn
  • if n > 0 then an <> 0
  • n <= 100

If there are no numbers meeting these criteria, output the sentence "The code cannot be decrypted.". If there are more possibilities, print any of them.


Sample Input

-935 2475 -11 -15
1 0 -3 -2
93 16 3 2
191 -192 11 -12

Sample output:

The code cannot be decrypted.
Warning: large Input/Output data, be careful with certain languages
Added by:Adrian Kosowski
Time limit:5s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel Pentium G860 3GHz)
Languages:All except: SCM chicken
Resource:ACM Central European Programming Contest, Prague 1999

hide comments
2014-12-11 14:49:29 Georeth Chow
Note the constraint:
if n > 0 then an <> 0
it's possible n == 0
WA several times
2013-12-07 15:20:11 BaburMB
you can store as sqrt(123-124)
2013-08-07 17:23:16 Aneeqa
it looks like algorithm :p
2012-05-25 12:18:21 nilesh soni
in every problem of spoj for int part of float no., simply x=int(x) does not accept
2012-03-07 11:45:23 CryptoViral
ha ha sqrt(-1).......:D
2011-06-09 05:01:18 rajendra
how to handle imaginary numbers.?? sqrt(-1) is not a number..
2009-12-08 19:13:24 Tasnim Khan
I don't think so.. It's just mathematics :P
© Spoj.com. All Rights Reserved. Spoj uses Sphere Engine™ © by Sphere Research Labs.