ACPC10A - What’s Next

According to Wikipedia, an arithmetic progression (AP) is a sequence of numbers such that the difference of any two successive members of the sequence is a constant. For instance, the sequence 3, 5, 7, 9, 11, 13 ... is an arithmetic progression with common difference 2. For this problem, we will limit ourselves to arithmetic progression whose common difference is a non-zero integer.

On the other hand, a geometric progression (GP) is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed non-zero number called the common ratio. For example, the sequence 2, 6, 18, 54 ... is a geometric progression with common ratio 3. For this problem, we will limit ourselves to geometric progression whose common ratio is a non-zero integer.

Given three successive members of a sequence, you need to determine the type of the progression and the next successive member.

Input

Your program will be tested on one or more test cases. Each case is specified on a single line with three integers (−10, 000 < a1, a2, a3 < 10, 000) where a1, a2, and a3 are distinct.

The last case is followed by a line with three zeros.

Output

For each test case, you program must print a single line of the form:
XX v
where XX is either AP or GP depending if the given progression is an Arithmetic or Geometric Progression. v is the next member of the given sequence. All input cases are guaranteed to be either an arithmetic or geometric progressions.

Example

Input:
4 7 10
2 6 18
0 0 0

Output:
AP 13
GP 54

Added by:Omar ElAzazy
Date:2010-11-30
Time limit:1.799s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:ACPC 2010

hide comments
2015-09-29 00:30:35
easiest qs!......took 3 lines......c...guys getting wa --->>>111 is a gp not AP
2015-09-26 15:52:30
what we get the output for 1,1,1
2015-09-26 15:52:19
what we get the output for 1,1,1
2015-09-16 06:20:50
for people using python use '==' instead of 'is' operator. 'is' gives you WA.
2015-09-02 15:28:39
easy one/ AC in first attempt :)
2015-08-29 06:42:35
for the people who are getting WA the input should terminate if you enter 0 0 0 until then we need to get input , and output has to be only integer.
2015-07-21 13:53:32 avidcoder
I wonder why only one logic gets Ac whereas other logics are WA. Why??
for a,b,c AP-> 2*c-a gets AC. but c+(b-a) WA.
for a,b,c GP-> k*(k/j) gets AC. but k*(j/i) WA.
I hate this problem
2015-07-15 21:26:23
> varun kumar: 2014-11-05 14:54:19
> its accepting c+(c-b) but not c+(b-a)
> and c*(c/b) but not c*(b/a)

The same in PHP

Last edit: 2015-07-15 21:26:41
2015-06-03 12:08:45 ADITYA SINGH
for those using the condition b==(a+c)/2, try a=1, b=2, c=4.
2015-05-31 09:18:23
2b=a+c and b*b=a+c and ("AP<space>%ld\n",output); are correct formats in c code :)
finally got ac:)
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