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POWPOW - Power with Combinatorics |
Your task is to find a^(exp^(b)),
a: Provided in input,10^5 => a >= 0
b: Provided in Input,10^5 => b >= 0
exp=(nC0)^2 + (nC1)^2 +(nC2)^2+ ... +(nCn)^2,
n: Provided in the input, 10^5 => n >= 0
As the answer can be too large , you need to output modulo 10^9+7.
nCr denotes n choose r.
Input
The first line of each input file contains number of test cases t (t<=1000).
Then follow a new line.
Then follow t lines, each containing 3 integers, (i.e. a b n in order) each of them separated by a space.
Output
Output Contains t lines, ith line contains the answer of the ith test case .
Example
Input: 1 1 1 1 Output: 1
Explanation
In First test case, the Value of exp is 2, value of 1^(2^1) is 1, so output is 1.
Added by: | devu |
Date: | 2012-07-13 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Own |
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2023-03-20 17:39:41
Tips: - would start with little fermat and derive exp^b in terms of mod p-1 - afterwards, use vandermon to derive simplification of exp - then, use chinese remainder thereom to find C(2n, n) - rest is straightforward |
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2021-07-09 19:41:28
What is there in test case 8 :( Got so many WAs without even a hint. Please help... ------edit------ Finally removed from todo list after 10 months... No words to describe the beauty of the problem... Last edit: 2022-05-07 11:24:52 |
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2019-06-15 09:08:12
Pre requisites: 1. Fermat's little theorem 2. Lucas theorem 3. Chinese remainder theorem 4. Modular exponentiation 5. Modular multiplicative inverse 6.Extended Euclidean Theorem For those getting WA on test case 8: Try to check your computation for exp For those getting TLE on test case 8: Try to do some pre computation Excellent problem to get strengthen all your mathematical concepts in competitive coding . AC after 8 attempts after getting WA and TLE on test case 8 Last edit: 2019-06-15 09:10:57 |
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2018-05-09 06:01:44
Anyone please comment the result for: 1 2 2 2 |
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2017-01-10 03:39:44
Wow What a question My 50th :) Last edit: 2017-01-21 14:41:57 |
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2015-07-20 15:53:13 Tanzir Islam
I got ac in this problem. However, there's something weird about this problem. In my solution, I wrote the function to calculate power like this, long long power(long long a, long long b, long long p) { if(a == 0) return 0; ...... } I got wa. Then I removed this if condition, I got ac. 0^b should be 0 for any value of b, shouldn't it ? |
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2015-01-25 14:59:55 Sayak Haldar
@psetter, is 0^0=1? like in powpow2 and tutorial version of it? edit 1: anyone who solves this problem, please help me by giving the answer.. Last edit: 2015-01-25 15:39:21 |
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2014-12-10 16:44:28 i need you
getting wrong answer in 8th judge...please suggest edit-done! Last edit: 2015-02-02 11:29:09 |
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2014-11-30 17:34:32 Mayank Ladia
testcase 8.. WA now :( Last edit: 2015-07-13 23:02:16 |
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2014-07-28 15:37:21 tapan sahni
getting nzec in java ...what to do |